By four months of age, babies should be able to hold their heads steady while sitting with support.
The rooting reflex is triggered when the baby's cheek is stroked. This causes the baby to turn and open its mouth, making sucking or “rooting” motions to assist with breastfeeding. This reflex should disappear by four months of age.
The Moro reflex, also known as the startle reflex, presents as an involuntary response that occurs when an infant feels as if it’s falling. The Moro reflex disappears in most infants by around 4 months of age, though it may be present in a minority of infants through 6 months.
Most children at four months old are able to reach across midline.
By four months of age, an infant will orient to voices, turning towards the source of the sound.
Babies can be expected to laugh by the time they are four months of age.
At four months old, infants enjoy looking around as their vision has improved and they can start distinguishing between shades, as well as being able to follow moving objects.
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