Baby Age Calculator

Baby Age Calculator is a free online tool that accurately calculates a baby's exact age in years, months, weeks, and days, and provides related milestones, zodiac signs, and birthstone guides. Built with precise mathematical calculations, it supports leap years and varying month lengths, helping parents and caregivers track developmental milestones and plan pediatric appointments. The service also offers a JSON API for developers and AI tools, delivering the same data without requiring an API key or sign‑up.

Baby Age Calculator is listed with 2 APIs on the APIs.io network. Tagged areas include Baby, age, Calculator, Parenting, and Health.

The Baby Age Calculator catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Baby Age Calculator’s developer surface includes documentation, API reference, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

19.7/100 emerging ▬ flat Agent 20/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessOpen

2 APIs 1 MCP Servers

BabyageCalculator Parenting Health Milestones

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 19.7/100 · emerging

Contract Quality 4.8 / 21

Developer Ergonomics 1.4 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 4.8 / 9

Regulatory Posture 3.8 / 15

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Health regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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<a href="https://apis.io/providers/babyagecalculator-com/"><img src="https://apis.io/badge/babyagecalculator-com/card.svg" alt="Baby Age Calculator on APIs.io — Kin Score by API Evangelist"></a>

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Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

11 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 22.8 — up to +19.3 composite points
Developer Ergonomics scores 8.3 — up to +18.3 composite points
Access Clarity scores 10.5 — up to +17.9 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/babyagecalculator-com/apis.yml: open an issue on github.com/api-evangelist/babyagecalculator-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Baby Age Calculator API

Free JSON API providing baby age, zodiac, birthstone, milestones without API key.

Baby Age Calculator API

Baby Age Calculator API as documented publicly: 21 operations. Contract generated from the documentation by API Evangelist (2026-11-02); not the provider's own document.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Baby Age Calculator MCP Server

Remote MCP server at babyagecalculator.com.

MCP SERVER

Baby Age Calculator API pricing

Pricing Plans 1

Published pricing tiers and plan structures.

Babyagecalculator Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Babyagecalculator Com Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Babyagecalculator Com Context

20 classes · 47 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Baby Age Calculator API Rules

32 rules · 29 errors 2 warnings 1 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

GetApiAgeCalculateResponse

8 properties

JSON SCHEMA

GetApiAgeResponse

8 properties

JSON SCHEMA

GetApiAgeResponse2

12 properties

JSON SCHEMA

GetApiBirthstonesMonthGetResponse

22 properties

JSON SCHEMA

GetApiMilestonesListResponse

9 properties

JSON SCHEMA

GetApiZodiacResponse2

9 properties

JSON SCHEMA

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Babyagecalculator Com Authentication

0 schemes

SECURITY

Babyagecalculator Com Domain Security

TLSv1.3 · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Babyagecalculator Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: babyagecalculator-com
name: Baby Age Calculator
description: Baby Age Calculator is a free online tool that accurately calculates a baby's exact age in years, months, weeks,
  and days, and provides related milestones, zodiac signs, and birthstone guides. Built with precise mathematical calculations,
  it supports leap years and varying month lengths, helping parents and caregivers track developmental milestones and plan
  pediatric appointments. The service also offers a JSON API for developers and AI tools, delivering the same data without
  requiring an API key or sign‑up.
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://babyagecalculator.com/logo.png
url: https://artifacts.apis.io/babyagecalculator-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-02 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-02'
modified: '2026-11-02'
tags:
- Baby
- age
- Calculator
- Parenting
- Health
- Milestones
tags_raw:
- baby
- age
- calculator
- parenting
- health
- milestones
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/babyagecalculator-com-rules.yml
- type: JSONLD
  url: json-ld/babyagecalculator-com-context.jsonld
- type: Vocabulary
  url: vocabulary/babyagecalculator-com-vocabulary.yml
- type: DataModel
  url: data-model/babyagecalculator-com-data-model.yml
- type: Conformance
  url: conformance/babyagecalculator-com-conformance.yml
- type: LLMsTxt
  url: llms/babyagecalculator-com-llms.txt
- type: MCPServer
  url: mcp/babyagecalculator-com-mcp.yml
- type: Hosts
  url: hosts/babyagecalculator-com-hosts.yml
- type: Vendors
  url: vendors/babyagecalculator-com-vendors.yml
- type: DomainSecurity
  url: security/babyagecalculator-com-domain-security.yml
- type: Website
  url: https://babyagecalculator.com/
- type: Documentation
  url: https://babyagecalculator.com/docs/
- type: APIReference
  url: https://babyagecalculator.com/docs/
- type: TermsOfService
  url: https://babyagecalculator.com/terms/
- type: PrivacyPolicy
  url: https://babyagecalculator.com/privacy/
apis:
- name: Baby Age Calculator API
  description: Free JSON API providing baby age, zodiac, birthstone, milestones without API key.
  humanURL: https://babyagecalculator.com/docs/
  baseURL: https://babyagecalculator.com/api/
  mcp:
    url: https://babyagecalculator.com/api/mcp
    toolsList: mcp/tools-list.json
  aid: babyagecalculator-com:baby-age-calculator-api
- aid: babyagecalculator-com:babyagecalculator-com-api
  name: Baby Age Calculator API
  description: 'Baby Age Calculator API as documented publicly: 21 operations. Contract generated from the documentation by
    API Evangelist (2026-11-02);

    not the provider''s own document.'
  humanURL: https://babyagecalculator.com/docs
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/babyagecalculator-com-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/babyagecalculator-com-get-api-birthstones-month-get-response-schema.json
  - type: JSONSchema
    url: json-schema/babyagecalculator-com-get-api-age-response2-schema.json
  - type: JSONSchema
    url: json-schema/babyagecalculator-com-get-api-age-calculate-response-schema.json
  - type: JSONSchema
    url: json-schema/babyagecalculator-com-get-api-age-response-schema.json
  - type: JSONSchema
    url: json-schema/babyagecalculator-com-get-api-milestones-list-response-schema.json
  - type: JSONSchema
    url: json-schema/babyagecalculator-com-get-api-zodiac-response2-schema.json
x-enrichment:
  date: '2026-11-02'
  status: enriched
  artifacts_added: 36
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Baby Age Calculator API — frequently asked questions

Does Baby Age Calculator have an API?

Yes. APIs.io lists 2 APIs from Baby Age Calculator, including Baby Age Calculator API and Baby Age Calculator API.

Is there an OpenAPI specification for the Baby Age Calculator API?

Yes. APIs.io indexes 1 OpenAPI specification for Baby Age Calculator, each linked for download from this page.

How do I authenticate with the Baby Age Calculator API?

Baby Age Calculator documents its authentication (0 schemes). The details are profiled on APIs.io as Babyagecalculator Com Authentication.

Does Baby Age Calculator have an MCP server?

Yes. APIs.io lists 1 MCP server for Baby Age Calculator: Remote MCP server at babyagecalculator.com.

Is the Baby Age Calculator API ready for AI agents?

Baby Age Calculator has a Kin Score of 19.7 out of 100 (emerging) and an Agent Readiness score of 19.9 (agent-aware), scored by API Evangelist on 2026-11-06.

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