Should i change my daughters milk shes 3months and since she was born i gave her the blue label similac, she would throw up most of it and would get really fussy after eating. i recently changed it to the sensitive similac which is for spit-up and gas but

How : How long has she been on the new formula? If it has been less than 2 weeks, give it a good month to see if the baby gets used to it and her constipation improves. You may want to consider completely switching from a milk based formula to soy based formula. If she does not tolerate soy, then you need to bring this isssue up with her pediatrician. Best of luck.