formula milk

hello mga mommies, my baby is 2 and half y/o, bigla nlang ayaw uminom ng formula milk😔 i am worried kasi 1 week na sya hindi umiinom ng milk kahit anung bigay namin, but he can eat rice nmn and piling ulam like hotdog, cornbeef and noodles, any suggestions or recommendations para bumalik sa pag inom ng gatas si baby. thank you po