Hi. my baby spits up a lot. he takes acid medicin. but he is still spitting up a lot. he is gaining weight. but he just spits up a lot. any advice ?

You hit the: nail on the head, he is gaining weight. Some babies despite what you do just spit up a lot. Their little valve at the top of the stomach just doesn't work very well yet. Every Time they burp, they bring up some stomach contents with the air. You and I don't do that cause our valves havre matured. It will get better. Use lots of burp clothes. As long as weight is going up, no worries!