A 17-year-old male bonobo eats while his son watches in the Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. Fiona Rogers/Getty Images hide caption
toddlers
Previous research has shown that babies in the first year of life understand that certain individuals tend to win in social conflicts — such as individuals that are physically larger, or that come from larger social groups. Rick Lowe/Getty Images hide caption
Amanda Williammee and her daughter Taycee. Now a happy preschooler, the little girl was born with neonatal abstinence syndrome — a condition that includes opioid withdrawal symptoms like tremors, irritability, sleep problems and high-pitched crying. Sarah Jane Tribble/KHN hide caption
For Babies Of The Opioid Crisis, Best Care May Be Mom's Recovery
Kaiser Health News
Toddlers need consistent care from a pediatrician to make sure, among other things, that they are hitting developmental milestones and their vaccinations are up-to-date. Tetra Images/Getty Images hide caption
By the time they're 18 months old, kids know when you're sad, even if you're not bawling. iStockphoto hide caption