baby vomit

Tasmina • Can't wait to meet my baby boy in April 😍
My LO has thrown up 5 times since this morning.after he is held up right after waking up from naps,he throws up.its very unusual for him to throw up.its not much & it's like yogurt.i called the dr , she said might just be acid reflux but wants me to go tomorrow if he's still throwing up. Any idea on what it could be , feeling concerned.