these precious teacup boys and girls are charting to only be 31/2 -4 lbs. At 11 weeks old now they weighs 1lb and 4 ounces. They have had their wellness check up . Does have an open font which is normal for tiny pups but vet said it should close. They are healthy, strong , thick boned so not a weak or fragile pups. Again please for more info, contact me xxx-xxx-xxxx with your phone number and email address..