'婴童' (yīng tóng) is a compound noun meaning 'infants and toddlers'—typically referring to children from birth up to about three years old. The first character 婴 (yīng) means 'infant' or 'newborn', often used in words like 婴儿 (yīng'ér, 'baby'); the second character 童 (tóng) means 'child' or 'young child', appearing in terms like 儿童 (értóng, 'children') or 少年 (shàonián, 'teenager'). Together, 婴童 emphasizes the earliest stage of childhood, especially in formal, commercial, or medical contexts.

This term is widely used in healthcare, parenting resources, product labeling (e.g., '婴童用品' — infant and toddler products), and public health guidelines. It carries a slightly formal or institutional tone—not common in casual speech among friends (where people say 宝宝 bǎobao or 小孩 xiǎohái instead)—but it's standard in official documents, advertisements, and pediatric settings.