<prompt> Infant body weight is tripled by age of5 months11 months2 years18 months  <response>: The average birth weight of neonates is about 3 Kg.During first few days after birth, the newborn loses extracellular fluid equivalent to about 10 of the body weight.Most full term infants regain their birth weight by the age of 10 days.Subsequently, they gain weight at a rate of approximately 25 to 30 gm per day for the first 3 months of life.Thereafter they gain about 400 gm of weight every month for the remaining part of first year. 