Three months if the baby weighs only 9 pounds, this situation indicates that the development is delayed, because the newborn child is about 5, 6 pounds, normal for children, a month to grow at least 2 pounds or more to be considered normal, so three months of the baby, the weight should be in about 11 pounds to be considered more normal. In general, we must first rule out disease factors, such as congenital lowered thyroid function, this condition children’s appetite is very poor, development is obviously affected, so be sure to first go to the hospital. Let the doctor diagnose and assess whether the child has a congenital disease, or other diseases caused by the weight does not increase. The other is the problem of nutrition. Many children are exclusively breastfed, but the mother’s breast milk is not enough, the child can not keep up with the nutrition, so the child eats less, this situation needs to strengthen nutrition, such as the mother eat more nutritious substances, and then more milk. For example, if you buy a carp soup, you can buy half a catty of carp, fry it in oil and put it in a stew with grass, it is easier to get milk, and adding milk powder can also make the child grow more satisfactorily. So, if your child’s weight gain is not satisfactory for three months, you must listen to the doctor’s analysis and give targeted treatment after a clear diagnosis.