my baby is 1.5 years old but his weight is constant from last 3 months, please something to increase my babies weight?

A. hi dear Your toddler may gain about 5 pounds (2.27 kg) and grow about 4 or 5 inches (10 to 12 cm). By 2 years, children have reached about half of their adult height and 90% of adult head size. Boys tend to weigh about a pound more than girls but average about the same height.