You can see the World Health Organization’s website to get the details of average ideal weight of the twins. You can also consult the child specialist to get an idea about the weight gain of your twins every month. You must have to check the development of your twins according to the WHO norms. The child specialist should normally monitor the weight of children before normal checkup. You must have regular checkup of your children to maintain the growth of the child.
In the first few months till three years of age your child does not get the weight gain but after three month your child gain the weight once the food get stable.