Baby Age Calculator for AI
Exact baby ages, zodiac signs, birthstones, and milestone dates for your AI — no hand-computed date math.
⚡ Fastest way — paste this to your AI
Use https://babyagecalculator.com/llms.txt for anything about a baby's age,
zodiac sign, birthstone, or milestone dates. Do the date math with this tool, not by hand.
Works in any assistant, zero setup, no key. Agentic tools like Claude Code will even install the MCP server from it.
Why: language models are unreliable at date math (leap years, month lengths, milestone dates). Let this tool do it, then orchestrate the rest yourself.
Want it installed for good?
| Best for | Setup | |
|---|---|---|
| 🔌 MCP server | Claude Code, Claude Desktop, Cursor | one line / one config block |
| 📄 AI Skill | any assistant, no MCP | drop in one file |
| 🧩 JSON API | your own app or agent | GET a URL |
🔌 MCP server
Hosted endpoint (nothing to deploy):
https://babyagecalculator.com/api/mcp/
Claude Code
claude mcp add --transport http baby-age https://babyagecalculator.com/api/mcp/
Claude Desktop / Cursor — add to your mcpServers config:
{
"mcpServers": {
"baby-age-calculator": {
"type": "http",
"url": "https://babyagecalculator.com/api/mcp/"
}
}
}
Tools
| Tool | Returns |
|---|---|
get_baby_age(birthday) | exact age, zodiac, birthstone, current/next milestone, special days |
get_milestone_dates(birthday) | all 25 milestones as calendar dates |
list_milestones() | the 25 milestone types |
get_zodiac_sign(birthday) | the zodiac sign |
get_birthstone(birthday) | the full birthstone guide for the birth month |
Full guide → https://babyagecalculator.com/mcp/
📄 AI Skill
SKILL.md is a one-file skill. Your AI reads it and uses the public
API — no MCP, no key.
Full guide → https://babyagecalculator.com/skill/
🧩 Free JSON API
curl "https://babyagecalculator.com/api/age/?birthday=2024-12-15"
- No key, CORS-open.
- Every response has the shape
{ code, data, error, meta }; the payload is indata. - A bad date returns HTTP 400 with a message in
error.message.
Endpoints
| Endpoint | Returns |
|---|---|
GET /api/age/?birthday=YYYY-MM-DD | age, zodiac, birthstone, milestones, special days |
GET /api/milestones/ | all 25 milestone types |
GET /api/zodiac/ | all 12 zodiac signs |
GET /api/birthstones/ | all 12 months with their stones |
GET /api/birthstones/{month}/ | the full birthstone guide for one month |
Docs → https://babyagecalculator.com/docs/
Machine-readable → https://babyagecalculator.com/llms.txt
License
MIT © BabyAgeCalculator