hello, i have a 9WO DD (she was born 3 weeks early so adjusted age would be 6WO), and she used to have terrible gas pain when i gave her regular Enfamil, so i switched her to Lactose-Free Enfamil, she is a bit constipated (she regularly poos every 2 or 3 days... with my help sometimes), but she still has gass and pain, and when she eats he little stomach makes so much noise, that i thought she may be better with a soy based formula, but if she is a bit constipated, would the soy formula make her worse?