Most buying questions are really fit questions. Which car seat does my child need now, and for how long? What size flange goes on this pump? Is the milk in the fridge still good? Will this seat fit on the plane? These free tools answer one of those each, from your own numbers, in a few seconds — before you buy, or when the thing is already in your hands. Nothing to sign up for, nothing to install.
Baby & Kids
Car seats, pumping, milk and flying with a baby — the answer the label, the CDC or the FAA gives, for your child.
- Which Car Seat Now? Car Seat & Booster Requirements CheckerRear-facing, harness, booster or belt — what NHTSA and the AAP recommend now, with your state’s law beside it.
- Breast Pump Flange Size CalculatorYour nipple in millimetres → the flange size to start with, in the sizes your pump’s maker actually sells.
- Is This Breast Milk Still Good? Storage TimerWhere the milk is and when it was pumped → the time it is good until, by the CDC’s limits.
- Can This Car Seat Fly? FAA Car Seat CheckerThe label, where it goes, boosters and CARES, and your rights if it does not fit — straight from the FAA’s rule.
Where the numbers come from
From whoever is responsible for them, quoted, with the date I last checked printed next to the answer. For children in cars that is NHTSA and the American Academy of Pediatrics, and for state laws the Governors Highway Safety Association’s table, gathered from IIHS and each state’s highway safety office. For milk it is the CDC and the Academy of Breastfeeding Medicine. For planes it is the FAA and the airline. For a pump, a seat or a scope, it is the manufacturer’s own page. Nothing is invented, and nothing is made to look more precise than the source is.
Where the official answers disagree, you see both
They disagree more often than you would think. Florida’s law lets a six-year-old ride in a seat belt; NHTSA keeps a child in a booster until the belt actually fits, which is usually years later. The CDC says freshly pumped milk is good on the counter for up to four hours; the breastfeeding doctors’ protocol calls six to eight acceptable when it was expressed very cleanly. Most pages quietly pick one. These tools print both, say who said which, and — where a child’s safety is involved — take the stricter one for the answer.
The label beats the tool
I write buying guides across a lot of shelves, and I am not a pediatrician, a lactation consultant or a car-seat technician. So every tool here says the same thing in its answer, not in small print: the sticker on your seat, the manual in the box and the advice of whoever has actually seen your child outrank any number on a web page, this one included. None of these tools will give a child a dose of anything, diagnose a symptom, or name a “safest” car seat — in the AAP’s own words, no one seat is.
Share an answer, or keep it
Every result has its own link. Copy link saves exactly what you entered, so you can send the car-seat stage to whoever is picking the child up, or keep the milk timer on your phone.
Put a tool on your own site
Every tool has an Embed button: a short piece of code for a parents’ group, a car-seat technician’s page or a forum. It works there exactly as it does here, free, with a credit line linking back.
More from the site
The tools answer the quick questions. For which one to buy — and, as always, who should skip it — start with the baby and kids’ guides or the latest posts.