Baby essentials
Newborn to twelve months — feeding, sleep, nursery, travel and the products that make the fourth trimester easier. Cut through the lists and focus on what matters for your baby.
Free tools & calculators for baby
Each calculator shows its method and is reviewed against clinical guidance — for planning, not diagnosis.
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Baby Age Calculator (In Weeks, Months and Days)
Enter your baby's birth date and get their precise age in months, weeks and total days — as of today or any date you choose.
Baby Sleep Schedule & Wake Windows by Age
Enter your baby's age in months and get recommended total sleep per day, a typical nap count, and how long they can comfortably stay awake at this stage.
Baby Weight & Percentile Growth Calculator
Enter your baby's sex, age in months and weight to see roughly where they sit on the WHO weight-for-age growth curve, from newborn to twelve months.
Baby Milk and Formula Intake Calculator by Age
Add your baby's age in months and optional weight to see a typical feed size, how many feeds a day, the daily total, and a weight-based cross-check.
Baby Food and Allergen Introduction Readiness Checker
Add your baby's age and tick the readiness signs to see where they sit on the starting-solids timeline, with guidance on first foods and introducing allergens early.
Formula Preparation Ratio: Scoops and Water
Enter a feed size and number of feeds to get the scoops and water per bottle and the total prepared volume, in ounces or millilitres.
Breast Milk Storage Calculator: How Long Expressed Milk Lasts
Choose where your milk is stored and the day you pumped it to see how long it stays good and get a clear use-by date for the bottle.
Diaper Size Calculator by Baby's Weight
Enter your baby's weight in pounds to see which diaper size fits now, the range that size covers, and roughly when you will move up to the next one.
Baby Teething Timeline: Which Teeth When
Enter your baby's age in months to see the teeth most likely coming now, the symptoms to expect, and gentle ways to keep them comfortable.
Explore Baby
The buying guides and product roundups we've published for this stage. Filter by what you're shopping for.
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Pregnancy Baby Toddler is independent product research and shopping guidance — not medical advice. Estimates and calculators are for information only. Read our medical & safety disclaimer.