lactation period; nursing period
Refers to the period during which a mother breastfeeds her infant, or more broadly the suckling stage in mammals.
Babies in the nursing period often wake up many times during the night.
Nutrition during the lactation period is greatly influenced by the mother's diet.
Compound of 哺乳 (ほにゅう, 'suckling, nursing') and 期 (き, 'period'). The word is straightforward and modern.