Sydney and Peyton went for their 15 month appointment... but they are 16 months old. Sydney is 30 1/2 inches tall, weighs 21 lbs 8 oz and her head is a mighty 18 3/4. Peyton is 31 3/4 inches tall, weighs 21 lbs 13 oz and her head is a mighty 18 1/4. The girls did fine with the shots, initially they cried but were good to go after some kisses and hugs.