Ava is not drinking as much as she used to, she used to drink 6 oz, and now shes like 4 here 5 here and when you do offer her the bottle shes screaming at it or other times, shes smiling and laughing at it. Is this some growth spurrt?? or what on earth is going on I am wasting sooo much formula lately! Also shes slooowly getting off her routine as well, sometimes she goes 4 hrs, soemtimes 3 and others as short as 2! Even when she takes 6 oz she can still be screaming for bottle at 3 hrs.. Im confused.. what is she doing?! Sleeping great at night still though!