2yr son only eat the same thing.

I’m having trouble making my son eat! He use to eat everything! He was the type who would open his mouth without looking at the food & just eat it. Now that’s he’s 2, he doesn’t even want to try it. He only wants to eat the same thing! MOSTLY ANYTHING BREAD! I want him to get use to eating! Im due with my 2nd baby in 2 weeks! & I’m afraid he won’t eat with my mom because she’s not use to his eating habits! I don’t know what to do. Is this a phase? Please HELP mommas!