Babies begin to discover and play with their hands by sight. Your baby will briefly hold a small toy voluntarily when it is placed in his/her hand. Your baby can shake a rattle to hear the noise but can´t pick the rattle up yet. Your baby will try to reach for toys but will most probably not be able to grasp it since she is still learning to judge distance.
When baby is on tummy he/she can hold their head up for prolonged periods. There is a lot less head lag when your baby is gently pulled into a sitting position by the arms when lying on her back.
Your baby will follow a slow moving toy from side to side. Moving a toy slowly from side-to-side for your baby to follow is an excellent development exercise at this age. Your baby will soon start to focus instantly on an object and easily follow the movements.
Your baby will squeals with pleasure when enjoying something and may start to anticipate coming events. For example, he/she may pull up their knees when placed on a changing table or smile with gleeful anticipation when put in a baby carrier of sling for an outing.
At four or five months, most infants can grasp an object that is within reach, looking only at the object and not at their hands. This important achievement is called top-level reaching and is considered an important milestone in fine motor development.
Babies can bring their hands together to play with them
Reaches for objects but frequently misses them
Your baby´s back muscles is getting noticeably stronger and your baby is starting to sit with a straight back
Although her heads still wobbles a lot the strengthened neck muscles is allowing her to partially control her head movements By the end of the fourth month your baby may completely raise her chest off the mat when doing tummy time, supporting herself on widely separated arms
Your baby has found her voice and will make use of every opportunity to practice!
You'll likely be entertained with a whole range of noises like squeals, shouts, gurgles and cooing
Your baby may try and hold a conversation with you and make more than simple vowel and consonant sounds Baby starts to blow through her lips and may blow some bubbles in the process
Your baby starts smiling at someone specifically. Your baby will smile eagerly at anyone paying him/her attention - your baby loves attention
Your baby is dealing with a lot of emotions (fear, sadness, frustration, anger and excitement) and needs you to respond sympathetically
Your baby knows your voice well and loves it especially when your tone is friendly.
All those brain connections you two have been working on is helping your baby´s brain to reach the point where it is able to combine what your baby see with what your baby taste, hear, and feel (this is called sensory integration). Infants wiggle their fingers, feel their fingers move, and see their fingers move. The integration between the senses contributes to your baby's sense of being an individual. Your baby may start to smile at his/her own reflection in the mirror but doesn't realize that they are actually smiling at themselves yet.
Your baby loves games and may even make up some of his own. Your baby is desperate to learn so make sure you provide a lot of age appropriate stimulation
Your baby is putting everything into his/her mouth. At this point a baby’s mouth is the most sensitive area and is therefore the best tool your baby has to explore and learn about objects. Be very careful, your baby is now entering the stage where a choking risk is real. Inspect your baby's toys regularly, especially wooden toys that could splinter and crack (it is impossible to see if the wood is cracked on the inside when the toys are manufactured). You also want to do some research on the companies manufacturing your baby's toys. Plastic toys may contain harmful phthalates. Know what products are used as surface finish for your baby's toys since these toys will be chewed on, sucked on and you don't want harmful paint, lead or chemicals going into your baby's mouth.
When buying toys, look for safe baby toys and buy from reputable manufacturers, all of them have websites. Wood is by nature anti-bacterial and German toy manufacturers like Haba uses only ecologically friendly and baby safe lacquer and coloring for their high quality toys.