system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why are babies always throwing up?
gpt
Do you mean spitting up? Like when you burp a baby and they spit up milk/formula?

It can be caused by a lack of control over their underdeveloped digestive system (being laid down immediately after feeding), being over-fed milk/formula prior to being burped, or drinking milk/formula too quickly (burping up air-bubbles due to improper feeding technique).

If you feed them in a semi-upright manner, take frequent breaks to burp them, and keep them upright after feeding, they will spit up less frequently.

If they are projectile-vomiting, it is a sign that they are ill, and require the care of a doctor.