Hello there! I made a mistake of feeding taho to my 6 month old.

I gave taho to my 6 month old baby. I thought it was safe bec my niece was given taho when she was 6 mos and she was okay. But, my baby is different and his tummy probably could not handle it yet. he started vomitting. He doesnt have fever or any other symptoms. He is just vomitting and a little weak. Any tips of how I can help him?