so I started Madelyn on gerber gentle and she drank 2-4 oz every 2-4 hours and then I just switched her to gerber soothe today and it seems like she's only drinking 2 oz at a time and not ever 4. she drank 4 oz when I first fed it to her and now it's like she's full after just 2 oz. anyone have a reason for this? or is it just a coincidence