Should I buy Similac 5g No. 4 or Similac Neosure?

Similac 5g No. 4 is a follow-on formula designed for infants from 6 months onwards. It is formulated with a unique blend of nutrients to support your baby's growth and development as they transition to solid food. It contains added iron, calcium, and vitamin D to support your baby's bone development and immune system. On the other hand, Similac Neosure is a specialized formula designed for premature or low birth weight babies. It is formulated with extra calories, protein, vitamins, and mineral