Hi, this is normal, they're growing up, be patience, you can try the formula a little ticker or thinner to get his interest, put a dab of Skippy's or Kroger's or Laura Scudder's Organic or Natural peanut. just a tad, tip of the spoon and stir it into their formula..It's a big world out there to them...LoL Can't wait for pictures.......I'll be doing more posts for you and the twins!! Jayd