My baby is almost two months old now, so he can wait for three hours until he needs to be breast-fed each time.
この場合、次のような言い方ができますよ。
ーMy baby is almost two months old now, so he can wait for three hours until he needs to be breast-fed each time.
「赤ちゃんがもうすぐぐ2ヶ月になるので、毎回授乳が必要になるまで3時間待てるようになった」
to breast-fed で「授乳する・母乳を与える」
ご参考まで!