From conception to delivery, or longer if you breastfeed, your baby is dependent on nutrients from you for the growth and development of all his cells, tissues and organs. In addition, research recently has uncovered a few other links between diet and your baby that you should consider.
Training is only half the equation in bodybuilding.
If you want to gain muscle size, you need to consume enough high-quality foods to replace the calories burned during training plus additional calories to support growth. Combined with physical activity, that amounts to a loss of about 1 pound a week, a healthy amount by most nutritionists' standards. Eat 4-6 smaller, nutritionally dense meals instead of three large ones. Choose foods from a variety of food groups, especially those from fresh sources. Don't worry, the fats will take care of themselves.