A good breastfeeding latch has a few clear signals: your baby’s mouth is open wide around the breast (not just the nipple), their lips are flanged outward, you can hear soft swallowing sounds, and any initial discomfort fades within the first few seconds. If you’re checking all of those boxes, your latch is likely working well. Here’s how to assess each one in detail.
What a Good Latch Looks Like
The most reliable visual sign is how much of your breast is in your baby’s mouth. A deep latch means your baby’s mouth covers not just the nipple but roughly 1 to 2 inches of the areola. This coverage should be asymmetrical, with more of the areola drawn in from the bottom than the top. If you can see a roughly even ring of areola above and below your baby’s mouth, the latch is probably too shallow.
Look at your baby’s lips. Both the upper and lower lip should be turned outward, like a fish. If either lip is tucked inward, especially the lower one, gently pull it out with your finger or break the latch and try again. Your baby’s chin should be pressed into the breast, and their nose should be free or just lightly touching.
What a Good Latch Feels Like
Many parents expect breastfeeding to be completely painless from the start, and that’s not always the case. A good latch typically produces a tugging or pulling sensation. In the early days while you’re both learning, you may feel a brief pinch when your baby first latches on, but it should fade within a few seconds. If the pinching doesn’t go away, or if you feel sharp, sustained pain throughout the feeding, the latch is too shallow.
Pain isn’t just uncomfortable for you. A shallow latch, where the baby is only sucking on the nipple, also prevents efficient milk transfer. So pain is a signal that both of you would benefit from relatching.
Sounds to Listen For
Once your milk lets down, your baby should settle into a rhythmic pattern of about one suck per second, pausing briefly every few sucks to breathe. During this active sucking, listen for swallowing. A good swallow sounds like a soft “kuh” or a quiet “huh-ah” deep in your baby’s throat. Some babies are louder swallowers than others, and both are normal.
What you don’t want to hear is clicking or smacking. These sounds usually mean the baby’s tongue is breaking the seal during the suck, which points to a shallow latch or, in some cases, a structural issue like a tongue tie.
Check Your Nipple After Feeding
Your nipple after a feeding session tells you a lot about what just happened. After a good latch, the nipple should look round and roughly the same shape it was before. If your nipple comes out flattened, creased, or wedge-shaped (sometimes called a “lipstick shape”), it may mean the baby was compressing it against the hard palate rather than drawing in enough breast tissue.
That said, nipple shape alone isn’t the whole picture. If you have particularly elastic breast tissue, your nipple may flatten without it being a problem. The combination matters: a flattened nipple plus pain plus a fussy baby is a concern. A slightly flattened nipple with no pain and a baby who’s gaining weight is usually fine.
Tracking Diapers and Weight Gain
Visual and sensory cues tell you about the latch in real time, but the longer-term proof is whether your baby is getting enough milk. Two things to track: diapers and weight.
After day five, a breastfed newborn should produce at least six wet diapers per day. The number of dirty diapers varies more, but you should see them regularly in the early weeks. On the weight side, newborns typically gain about 1 ounce per day in the first few months. Most babies lose some weight in the first few days after birth, but they should be back to their birth weight by about two weeks. If your baby is meeting these benchmarks, your latch is doing its job even if it doesn’t look textbook-perfect every time.
How Tongue Tie Affects the Latch
Some babies have a short or tight band of tissue under the tongue (called a tongue tie) that physically limits how far the tongue can move. Because a deep latch requires the baby to extend their tongue over the lower gum to cup the breast, a restricted tongue can make latching difficult or impossible without intervention.
Signs that suggest a tongue tie include difficulty latching at all, crying when trying to latch, clicking sounds during feeding, and a tongue that looks heart-shaped or notched at the tip. Not all tongue ties cause feeding problems, but if you’re seeing multiple latch issues alongside these signs, it’s worth having it evaluated. A lactation consultant or pediatrician can assess tongue mobility quickly.
How to Fix a Shallow Latch
If your latch checks are coming up short, the fix is usually about technique and positioning rather than anything being wrong with you or your baby. The goal is an asymmetrical latch where the baby leads with their chin and takes in more breast tissue from below.
Start by holding your baby so their nose is level with your nipple, not their mouth. This encourages them to tilt their head back and open wide. Wait for a big, wide-open mouth (you can encourage this by brushing your nipple against their upper lip) and then bring the baby to the breast, chin first. The lower jaw should land well below the nipple, so that more of the underside of the areola is drawn in. If it doesn’t feel right, break the suction by slipping a finger into the corner of your baby’s mouth and try again. Relatching as many times as needed is completely normal, especially in the early weeks.
Positioning matters too. Whether you prefer cradle hold, cross-cradle, football hold, or side-lying, the key principle is the same: your baby’s ear, shoulder, and hip should be in a straight line, their body turned fully toward yours. A baby who has to turn their head to reach the breast will have a harder time latching deeply.
What Professionals Look For
If you work with a lactation consultant, they’ll likely assess five areas: how well the baby latches on, how much audible swallowing they hear, your nipple type, your comfort level during the feed, and how much help you need positioning the baby. Each of these gets scored on a simple scale, and the overall picture guides their recommendations. Even one visit can make a significant difference if you’ve been struggling. Many hospitals, pediatric offices, and WIC programs offer free or low-cost lactation support.