Foods rich in tryptophan (an amino acid), such as dairy products, can compensate for not consuming enough niacin in the diet because the body can convert tryptophan to niacin. Niacin is sometimes used in two ways: as a synonym for nicotinic acid and as a broader term that includes nicotinamide and nicotinic acid, two forms of this B vitamin.
Most babies are able to begin sitting up when they reach the age of 4 months. However, some of them might need more time and start sitting independently when they become 7 months old. Until this time, the baby would definitely have learned how to roll and would be able to hold his head up too.
While you can prop your baby in a sitting position almost from day one, true independent sitting doesn't begin until he has head control. Starting at about 4 months, your baby's neck and head muscles strengthen rapidly, and he'll learn to raise and hold his head up while he's lying on his stomach.hile you can prop your baby in a sitting position almost from day one, true independent sitting doesn't begin until he has head control. Starting at about 4 months, your baby's neck and head muscles strengthen rapidly, and he'll learn to raise and hold his head up while he's lying on his stomach.