Hi, thanks for the info. I did try that growth chart but must be doing something wrong because they are showing to be WAY above where they should be for their age. In ounces, they are as of today (16 weeks) 65 ounces and 81 ounces. If I double their 12 weeks weight, they would be full grown at 5.4 and 6.2 pounds. So I am confused...