Aww, vitamin A supplements can be a bit strong sa tummy talaga, lalo na pag bata pa lang ang LO! One of my mum friends's kid din nag-vomit after vitamin A, so definitely not unusual, minsan kailangan lang i-adjust ang timing or take it with food, pero mas maganda kung i-check mo muna with the pedia kung normal lang ba or kailangan ng ibang brand na mas gentle. Hope your baby feels better soon!