It's absolutely normal, it's the extra feed. By 3 months it will settle.

babies regurgitate milk in small quantities either because they have been overfed or when the baby gulps in air while feeding and releases partially digested milk when their stomach contract. Most babies outgrow this between six and twelve months but you can avoid this by keeping your baby still during and after a feed and by remembering to burp him during a feed as well as afterwards. <br> Spitting is actually part of your baby&#8217;s developmental process. It happens because your little one is just learning the process of taking in food and sending it forward into the digestive system. Some babies might spit up only occasionally and others may spit up shortly after every feed.