Your child, your say. :) Glad you both manage to come to terms with not giving in to society's expectations.
Don't worry about the weight. For me as long as they are active, are fed, pee and poo as usual then they are fine. My second was almost 4kg at birth but she was only around 7-8kg at 1 year old. Healthier than her brother who was heavier at that age, and grew so fast we couldn't catch up.