The immune system is pretty much non-existent when a baby is born. Therefore, it's essential to breastfeed the baby as the mother's milk is complete nutrition for the baby. Maternal antibodies help babies develop immunity and protect them from diseases and infections. As a child continues to grow, it takes 7-8 years for them to develop their maturity fully. After exclusively breastfeeding for the first 6 months, pay attention to what food you're providing to your child. Ensure it's as nutritious as possible, and avoid junk food or processed food as much as possible.