1. Rolls over both ways
Rolling over is an important milestone as it means the baby is becoming stronger and more coordinated. Babies will start to roll over sometime between 4 and 7 months old.
2. Begins to understand object permanence
Object permanence is the understanding that objects continue to exist even when they cannot be seen. This milestone usually occurs around 4-6 months old.
3. Smiles at people and responds to other social stimuli
Babies will start to smile at people around 4 months old and will begin to respond to other social stimuli such as voices and noises.
4. Begins to babble and imitate sounds
Babies will start babbling at around 4 months old and will begin to imitate the sounds they hear.
5. Holds head up steadily for short periods of time
By 4 months old, many babies can hold their heads up steadily for short periods of time. This is an important milestone for developing neck muscles.
6. Vocalizes displeasure or displeasure with certain events
Babies will start to vocalize their displeasure or displeasure with certain events from 4 months old onwards. This can include crying, fussing, or moaning.
7. Reaches for objects and brings them to mouth
Many babies will start reaching for objects at around 4 months old and bringing them to their mouths. This is an important milestone for developing hand-eye coordination.
8. Shows an interest in looking in a mirror
Many babies begin to show an interest in looking in a mirror from around 4 months old onwards. This milestone may include fascination with their own image or trying to grab at themselves in the mirror.
9. Crawls well on the stomach
By 4 months old, many babies are able to crawl well on their stomachs. This is an important milestone for developing motor skills.