3 month old sleep

so my daughter is gonna be 3 months on July 4th. she's kind of going through 3-4 day periods of eating for a total of 3.5-4.5 hrs a day and sleeping around 12 hrs, then she'll get 3 or 4 days of eating 2-3 hrs a day and sleeping closer to 15. the days she eats less it seems she gets up more at night...but I am doing what I can to feed her to the max. she is ahead of the growth curve (86% in weight and 99% in length) and she's wetting 7-9 diapers a day. I guess my question is what else can I do to get her sleeping the 6 hour stints more consistently? Or should I just let her cycles naturally fluctuate?