Did you wean your baby off of breastfeeding and start giving him/her solid food already?
Did you already wean your baby off of breastfeeding already?
もう赤ちゃんは離乳させた？
weanはおしゃぶりや粉ミルクについても使えますね。
Did you wean your baby off of breastfeeding and start giving her solid food already?
もう(女の）赤ちゃんは離乳させて固形物食べてるの？
男の子ならherの代わりにhimになりますね。
ご参考になれば幸いです！
"もう赤ちゃんは離乳させて固形物食べてるの？"
- Have you weaned your baby onto solids yet?
- Have you weaned your baby yet?
- Have you started weaning your baby onto solids?
- Have you finished weaning your baby onto solid foods?
アメリカ合衆国 
