At four months old, your baby has developed noticeably stronger neck muscles but still needs consistent support when you hold them. Most babies this age can raise their head while lying on their stomach and are starting to push up on their arms, but they can’t sit independently or hold their head perfectly steady in every position. That means you have more flexibility in how you carry them compared to the newborn stage, while still needing to pay attention to their head, spine, and hips.
What Your Baby Can Do at 4 Months
The biggest change from the newborn phase is head control. Your baby’s back and neck muscles have been getting stronger, and they can likely lift their head and chest during tummy time. Some four-month-olds are even starting to arch their back and push up on their arms. This growing strength opens up new holding positions, like facing outward or sitting upright on your hip, that weren’t safe a couple of months ago.
That said, “stronger” doesn’t mean “fully stable.” Your baby’s head may still wobble during transitions, like when you shift them from one position to another, or when they get startled. Keep a hand ready to catch their head anytime you’re changing positions. If your baby hasn’t shown much improvement in head control by this age, it’s worth mentioning to your pediatrician.
The Cradle Hold
This is the classic position most people picture: your baby lying in the crook of one arm, face up, with their head resting near your elbow and their body along your forearm. Your other hand is free to support their bottom or do other things. At four months, your baby is heavier and longer than when you first brought them home, so make sure their weight is resting against your body rather than dangling off your arm. Keep their head slightly elevated above their stomach, which helps with digestion and keeps their airway clear.
The Shoulder Hold
Hold your baby upright against your chest with their head resting on or just above your shoulder. One hand supports their bottom, the other rests on their upper back. This is a natural position after feeding because it keeps your baby’s torso vertical, which helps trapped air rise. It’s also a great soothing position since your baby can hear your heartbeat and feel the warmth of your body. At four months, your baby will likely peek over your shoulder and look around, which is a sign their neck muscles are doing their job.
The Hip Carry
As your baby’s trunk strength improves, you can start carrying them on your hip. They sit on one side of your body, straddling your hip, with one of your arms wrapped around them for support. This position works well for short carries around the house and frees up your other hand. Your baby’s legs should spread naturally around your torso, with their knees roughly at the level of their belly button or slightly higher. This spread-squat shape, sometimes called the M-position, is the healthiest alignment for developing hips.
Hip-Healthy Leg Positioning
However you hold your baby, their leg position matters for hip development. The International Hip Dysplasia Institute recommends that a baby’s thighs be spread apart and supported, with the knees slightly higher than the buttocks. In this position, the ball of the hip joint sits centered in the socket, which supports healthy growth of the joint. The ideal range is roughly 40 to 55 degrees of spread and 90 to 110 degrees of bend at the hip.
You don’t need a protractor. Just aim for a natural frog-leg shape where the legs aren’t dangling straight down or pressed tightly together. If your baby’s hips are bent up more (like in a cradle hold), they need less spread. If the hips are straighter (like in a carrier), a wider spread keeps things stable. Babies actually have an instinct for this: when you pick up an infant under the arms, they’ll reflexively bend their hips and knees and spread their thighs, preparing to cling to your body.
The Belly Hold for Gas Relief
If your baby is fussy with gas or a stomachache, try what’s sometimes called the “tiger in a tree” hold. Your baby lies face down along one of your forearms, with their head near your elbow and their legs straddling your hand. Your other hand rests on their back for security. The gentle pressure of your forearm against their belly, combined with your body heat, helps trapped air escape and can calm a colicky baby quickly.
A few things to keep in mind with this position: take a firm, confident grip rather than a tentative one, since a secure hold is actually safer than a hesitant one. And avoid this position right after a feeding, because the pressure on the stomach can cause your baby to spit up.
Holding Your Baby for Feeding
Whether you’re breastfeeding or bottle feeding, your baby’s head and shoulders should always be elevated above their stomach. Nationwide Children’s Hospital emphasizes that babies should never be fed while lying flat, as this increases the risk of choking and can allow milk to pool near the ear canals, raising the chance of ear infections. Tilt your baby back at a comfortable angle with their head and back supported, so gravity helps milk flow down rather than pooling in the throat.
Never prop a bottle against a pillow or blanket and leave your baby to feed unattended. Beyond the choking risk, your baby can’t regulate the flow of milk on their own at this age.
Burping Positions
The shoulder hold described above works well for burping, but there’s another option that many parents find even more effective at four months: the lap sit. Sit your baby on your lap facing away from you. Place one hand flat against their chest with your fingers gently supporting their chin and jaw (not their throat). Lean them slightly forward, then use your free hand to rub or pat their back. This upright posture compresses the stomach gently and gives air a straight path up and out. Try both the shoulder and lap-sit methods and see which one produces results for your baby.
Facing Your Baby Outward
Four months is the earliest age most babies can safely face outward, whether you’re holding them in your arms or using a structured carrier. The key requirement is steady head control with no wobbling. If your baby’s head still bobs when they’re upright, wait a few more weeks. Most babies are reliably ready between four and six months.
To hold your baby facing out in your arms, support them under their bottom with one arm while the other wraps across their chest. Their back rests against your torso. Make sure their legs stay in that supported M-position rather than hanging straight down. One important safety note: if your baby falls asleep while facing outward, turn them inward or lay them down. A sleeping baby facing out can let their head drop forward, chin to chest, which can partially block their airway.
Supporting the Spine
Your four-month-old’s spine still has a natural C-shaped curve and won’t straighten into the adult S-shape for months. When you hold your baby upright, try to support this rounded posture rather than forcing them into a rigid, straight-backed position. Research published in the Journal of Biomechanics found that how well caregivers support the natural spinal curve varies widely when carrying babies in arms, but that holding your baby snug against your body tends to maintain healthy alignment.
If you’re helping your baby practice sitting (which is appropriate at this age), support their back with your hands or prop pillows around them. They’re building the trunk muscles they’ll need for independent sitting over the next couple of months, but they’ll topple without help.
Mistakes to Avoid
The most common holding error is letting your baby’s chin drop to their chest. This position partially blocks the airway, and at four months, your baby may not have the strength to lift their head back up on their own, especially if they’re sleepy. It’s a risk in car seats and bouncy seats too, not just in your arms. Anytime your baby is in an upright or semi-reclined position, glance at their chin: it should be off their chest with a visible gap.
Another mistake is picking your baby up under the arms without supporting their chest or back. At this age, their torso muscles aren’t strong enough to keep them stable if they’re just dangling. Always slide one hand behind their back or under their bottom before lifting. And when passing your baby to someone else, make the transfer slowly and deliberately so both people have a secure hold at all times.