Parenting

Feeding, growth, sizes, sleep, allowances and the logistics of running a household with children in it. 37 calculators. The health-adjacent ones give you a number to bring to a paediatrician, not a substitute for asking one.

Baby formula works from the usual guidance of about 2.5 fl oz per pound of body weight per day, spread across feeds, and shows the per-feed amount alongside the daily total. Worth knowing that the daily figure is the one that matters. Babies vary enormously feed to feed, and a light feed followed by a heavy one is normal. Parents who track each individual bottle against a target tend to worry about noise.

Child height prediction uses the mid-parental method, and it comes with an honest error bar: give or take about 4 inches, which is wide enough that people are often disappointed by how vague the answer is. That width is the truth of it. Anyone quoting a single confident number for adult height from a toddler is guessing.

Growth percentile pages need the right chart, and the page asks which. WHO charts are based on breastfed infants across six countries and are the standard for under-2s. CDC charts are US reference data for older children. The same measurement lands on a different percentile depending on which you use, which surprises parents comparing notes.