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In infants the common cause of puking is Gastroesophageal reflux which is due to lax lower esophageal sphincter.
As age increase this problem will subside, in 80 percent by 6 months and in 90 percent by 1 year.
Nothing to worry as the ultrasound
is normal and your doctor examine your child.
Documentation of weight is important as to compare the present one with the previous one.
As the age increases the weight will increase, but the rate of weight gain decreases. In the initial 2 months the daily weight gain is 30 grams per day and from 3 months of age it is 20-25 grams per day.
Try to give small feeds frequently and burp the child after every feed and before burping hold the child in vertical position for 5 to 10 minutes.
Prokinetic drugs like domperidone
can be give to decrease the vomitings after consulting your Pediatrician