My 4 years old is vomiting very frequently from years 1, after starting solid foods. But he is extremely active child. We even took an abdomen scan and everything came out positive. But seeing him vomiting very often makes me worried. I had septate uterus and he is born with adherent placental condition with birth weight of 2.3 kgs at 9 months. And now he is weighing 15+.is the weight gain enough for his age? What may be the cause of continuous vomiting?