Will my newborn be okay??????

My 3 year old & my 1 month old we’re taking a bath together when I was washing my newborn with a washcloth my son took the cup and poured water into the baby’s face and he drank some & got some water in his nose & couldn’t breathe for a couple seconds.

I’m freaking out that he could die from this. Is he going to be okay? Should I take him in?

Edit to comment- he is usually really good in the bath with him. He doesn’t bring any toys in & will usually just observe everything happening with me cleaning his baby brother. He just wanted to help me but understands that he made a bad choice.