Baby vomit

So my 7 week old vomits a few times a week after a feeding, usually in the evening. Will happen 10-30 minutes after a feeding while she is upright.

She is formula fed with pro sensitive. She’s been doing it since week 1 but it seemed to get better. It’s back again. She isn’t bother during or after the episode. She has been gaining weight appropriately. Any suggestions?