Every tool on this site

Nine calculators for the countable parts of the first year. Each one shows its working.

These are instruments rather than articles. You put in what is true of your baby — a weight, an age, a laundry interval, a brand of diaper — and the tool returns a number, the arithmetic behind it, and the source the rates came from. Nothing is stored, there is no account, and every one of them runs entirely in your browser.

Where a published figure exists, the tool uses it and names the publisher. Where none exists — nobody publishes an authoritative count of how many bodysuits a newborn needs — the tool asks for the missing variable and shows the multiplication instead of inventing a round number.

01 Can Baby Eat This? Type a food and your baby's age and get the answer: whether it's safe yet, from what age, exactly how to serve it so it isn't a choking hazard, and what the allergen guidance actually says — sourced from the AAP and CDC. Feeding 02 Diaper Size Finder Enter your baby’s weight to get the diaper size that fits, roughly how many you’ll go through before the next size, and the signs it’s time to move up. Diapering 03 Hospital Bag Checklist Answer four questions and get a hospital bag checklist built for your delivery — what to pack, what to skip because the hospital supplies it, and a printable list to tick off. Before the birth 04 Postpartum Essentials Checklist Answer three questions and get the postpartum supplies to have at home for the first six weeks — tuned to how you gave birth and how you're feeding, with the warning signs that mean call your provider. Recovery 05 Newborn Essentials Calculator Every other list tells you to buy bodysuits. This one tells you how many, based on how often you do laundry — plus what to buy before the birth, what can wait, and what to skip. Before the birth 06 Baby Registry Checklist Generator Answer five questions and get a personalized baby registry — must-haves, nice-to-haves, and the things you can genuinely skip — tuned to your season, feeding plan, budget, home and childcare. Registry & planning 07 Diaper Cost Calculator Enter your baby’s age and the kind of diapers you buy — get diapers per day, your monthly and first-year cost, and how store brand, name brand, premium and cloth actually compare. Baby costs & budgeting 08 Formula Feeding Calculator Enter your baby’s weight and age to estimate ounces of formula per day, per feeding, cans per month and what it costs — using the AAP’s published 2.5 oz-per-pound rule. An estimate, not medical advice. Feeding 09 Baby Clothes Size Finder Enter your baby’s age, weight and length to get the US clothing size to buy — plus the size to buy up to, so you’re not paying for clothes they’ve already outgrown. Clothing & sizing 10 Baby Sleep Schedule Pick an age and a wake time, and get a sample day plus the published total-sleep range for that age. Sleep

What is not here

There are no product reviews and no "best of" rankings on this site. What parents report after living with a thing is collected separately in the field notes, with a thread count and a link on every claim, and food-safety answers live in the food checker with the AAP or CDC page they came from.

Every number here is sourced — or the arithmetic is shown. Where nobody publishes an authoritative figure, we say so instead of inventing one. Nothing you type is stored.