My 11 m old is refusing solids.

The breakfast that usually contains oatmeal or fruits eats but dinner and lunch no, takes 3-4 bites spoon and then turn head around and refuses to eat anymore.

Formula only given first in the morning when wake up and before sleep at night.No feeding during the night.

I’m concerned not to give proper vitamins and minerals if not eating.

I give food that i gave before and which used to be eaten very well.

Is this just a phase ? how should i handle this