My little girl Hollee is one yr old and weighs 3.3lbs. Her weight hasn't changed since she was about 9mths. She has been fully trained to go out side since about 4mths. She follows her big sister Lucy who is a Dachie and is 12yrs old. Hollee sleeps on our bed all night. We put her out at about 10.30pm for a last potty and again at 6am. She can't get off our bed so we know she holds all night and is fine. Good luck with your little one. She is also the alpha and talks a lot to us. Ax