Not supporting the head can result in injuries. A newborn baby has weak head and neck muscles and very little strength to move their head. If the head isn’t supported it will flop backward or forward and startle the baby, making it feel very insecure. Any sudden movement of the baby’s head can also activate the Moro reflex which is a startle reflex. If this is activated the baby will become stressed. The head will need constant support for around 3 to 4 months.