If you check a first-morning urine before walking around and it's OK, then you don't have to worry. She just switched from Prosobee to Enfamil with Iron. She could be, but probably is not. If she is gaining weight nicely, then occasional vomiting is normal. If the vomit is green, then you have to really worry and call the doctor.
Most babies do have projectile vomiting at some point during the first few weeks to months.
He is 8 months old and refuses to even roll onto his tummy, but will attempt to furniture surf and is actively mobile. I think the most important thing for the mom is to not worry. The child will crawl when ready or may bypass crawling and go straight to a stand. Mamma can't make the baby do anything it doesn't want to. My baby was born a month early, and they said he would be a month behind in skills.