Health

Fetal Development Timeline (by Gestational Week)

See week-by-week fetal development from conception to birth (40 weeks). Enter your LMP date or a known gestational age and the tool highlights the current week with size, weight and milestones.

html· HTML resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/fetal-development-timeline' \
  -H 'Content-Type: application/json' \
  -d '{"mode":"weeks","weeks":20,"lmp":"Select the first day of your last period","precision":0}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/fetal-development-timeline

Parameters

Name	Type	Required	Description
mode	select	No	—
weeks	number	Yes	—
lmp	date	No	—
precision	number	No	—

Response format

HTML result

JSON

{
  "result": "<div>Processed HTML content</div>",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-fetal-development-timeline": {
      "name": "fetal-development-timeline",
      "description": "See week-by-week fetal development from conception to birth (40 weeks). Enter your LMP date or a known gestational age and the tool highlights the current week with size, weight and milestones.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=fetal-development-timeline",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "fetal-development-timeline",
    "arguments": {
  "mode": "weeks",
  "weeks": 20,
  "lmp": "Select the first day of your last period",
  "precision": 0
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

Browse tools Open tool

curl -X POST 'https://api.elysiatools.com/en/api/tools/fetal-development-timeline' \ -H 'Content-Type: application/json' \ -d '{"mode":"weeks","weeks":20,"lmp":"Select the first day of your last period","precision":0}'

Name

Type

Required

Description

mode

select

—

weeks

number

Yes

—

lmp

date

—

precision

number

—

{ "mcpServers": { "elysiatools-fetal-development-timeline": { "name": "fetal-development-timeline", "description": "See week-by-week fetal development from conception to birth (40 weeks). Enter your LMP date or a known gestational age and the tool highlights the current week with size, weight and milestones.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=fetal-development-timeline", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "fetal-development-timeline", "arguments": { "mode": "weeks", "weeks": 20, "lmp": "Select the first day of your last period", "precision": 0 } } }