反哺[hanpo] caring for one's parents in return
哺育[hoiku] nursing
哺乳[honyuu] lactation
哺乳動物[honyuudoubutsu] mammal
哺乳瓶[honyuubin] baby bottle

哺乳類[honyuurui] mammal
哺乳期[honyuuki] lactation period
握髪吐哺[akuhatsutoho] (a statesman making) extraordinary efforts to find and employ capable persons (persons of great wisdom)
哺乳類型爬虫類[honyuuruigatahachuurui] mammal-like reptile
哺乳類学[honyuuruigaku] mammalogy