are spit ups common in a 1 month old? also do babies have the ability to overfeed themselves?

A. No need to worry for vomiting  Its called as posseting.  Burp properly after each and every feed for atleast 10 min or till baby take 4 burp  Feed ur baby as per baby's demand only  Don't overfeed ur baby  Keep a watch on urine output  Baby should pass minimum urine 6-8 times per day  If persistent vomiting then need to consult