Hello, The problem may be,, this 15months old baby is finding difficulty adjusting to both the environment like day care and the home. It is little difficult for working women to take care of baby during working hours and that confuses the to whom to adjust whether to person in day care Center or to her mom. By this age baby should have little more than the 3 times of her birth weight. If the weight is less then please consult the pediatrician about this.