For how we live.
A cohort of 4,018 children found nearly half were picky at some point, but two-thirds remitted within three years and prevalence fell to 13.2% by age 6. About 4% stayed persistently picky.
A prospective study found that beginning intensive training before 27 months did not bring completion any sooner — and lengthened the process. Normal completion ages span well over a year.
WHO data put the normal window for walking alone at 8.2 to 17.6 months. The 2022 CDC checklists moved to the age by which 75% of children reach a milestone — to flag real delay, not redefine normal.
A randomised trial tracked infants' cortisol and attachment; a five-year follow-up tracked mental health. Graduated extinction improved sleep with no sign of long-term damage — or lasting benefit.
The AAP advises room-sharing without bed-sharing. Pooled case-control data show bed-sharing raises SIDS risk — sharply when parents smoke or drink, and more modestly even when they do not.
A meta-analysis of 16 studies and a daily-temperature cohort agree: tooth eruption brings gum irritation, drooling and fussiness, and at most a slight temperature rise — not a true fever.
The LEAP trial cut peanut allergy in high-risk infants from 13.7% to 1.9%. A second trial found the benefit real but harder to achieve — and only in children who actually ate the food.
Longitudinal data and a meta-analysis of 159,425 children find consistent associations between screen time and development — but the effects are small, observational, and thinner than the guidelines imply.