Jannie--she is a doll! I read on this forum that you can take the 4 month weight, double it and add 5-10 pounds. Last Saturday, (one week shy of 4 months), Dakota weighed 28 pounds. I'm aticipating he will be 30-32 at 4 months, and I'm guessing his adult weight will be 70-75 pounds. Sounds like your little one will be about that too--'course body chemistry can change. I'm also assuming that 4 months is 4 months and not 16 weeks. for Dakota, 4 months is 17 weeks . . .