All babies spit up. Occasional spit up is normal. Overfeeding and increased air ingestion can exacerbate this. If you notice your baby spitting up after most feedings try smaller more frequent feedings and burping more often during feeds. Keeping the baby upright for 15-20 minutes after feeding may also be helpful. If your baby is having excessive spit up, seems to be losing weight, or projectile vomiting you need to bring him to the office to be seen.