Help please

My 18 month old is currently going through a lot of changes, and I just want to see if this is normal or not.

-went from being a great eater, to only eating cheese and yogurt.

- went from always drinking water throughout the day to me forcing it on him.

-same with milk before nap and bedtime, he doesn’t want it.

-went from napping everyday from 12-3, to only napping from 12-130.

-grumpy throughout the day

I am due with my second baby in one week, so I don’t know if he feels a change coming or if this is something more serious. Any help or advice is welcome, thank you Momma’s!