A Weak Suck While Nursing – Signs, Causes & How to Fix it

When Baby Has a Weak Suck – What You Need to Know

Breastfeeding isn’t always as natural and effortless as it sounds. If your baby seems to be struggling to nurse effectively, especially if they latch but don’t seem to suck strongly or stay on, you might be dealing with what’s called a “weak suck.”

Let’s walk through what that means, what causes it, how to spot the signs, and most importantly—what you can actually do to help your baby (and yourself).

What Is a “Weak Suck” Exactly?

A weak suck is when your baby isn’t sucking strongly enough to effectively remove milk from your breast. This can mean:

• Short, shallow sucking
• Falling asleep at the breast quickly
• Latching on but slipping off frequently
• Not swallowing much milk (you might not hear that rhythmic “gulping”)

This isn’t the same as a poor latch (though they often go hand in hand). Even with a decent latch, a baby can have a weak suck if their mouth or tongue muscles aren’t doing their job properly.

Why Does a “Weak Suck” Matter?

Because milk transfer = milk supply. If your baby isn’t sucking well, they aren’t removing enough milk. That can lead to:

• Poor weight gain (or even weight loss)
• Less milk production over time
• Frustration for both of you
• Sore nipples (if baby keeps re-latching)
• Risk of engorgement or plugged ducts

It can also be emotionally draining. Many parents feel like they’re doing something wrong—but that’s not the case. A weak suck has causes, and those causes are usually treatable.

Common Causes of a Weak Suck

Let’s break it down. There are a bunch of reasons a baby might not be sucking well:

Baby-Related Causes

• Prematurity or low birth weight
• Tongue-tie (limited tongue movement)
• Jaundice or illness
• Sleepiness after birth (meds or long labor can cause this)
• Neurological impairment (may include body arching, clenching, or biting while feeding)
• Low muscle tone or “floppy baby syndrome”
• Oral aversion (resisting anything in the mouth, often from suctioning at birth)
• Sensory integration issues (baby struggles to focus on feeding due to sensory overload)
• Neonatal Abstinence Syndrome (babies exposed to drugs in the womb may have poor coordination)
• Anatomical differences like a high-arched palate or cleft lip/palate

Technique-Related Causes for a Weak Suck

• Shallow latch or awkward positioning
• Overly full breasts (making it hard to latch and compress)
• A fast let-down reflex that overwhelms the baby
• Bottle-feeding or pacifier use before breastfeeding is well established can cause nipple confusion ( nipple confusion and how to avoid it)
• Jaw clenching or “gum biting” behaviors

Secondary Factors

• Low milk supply can make feeds frustrating for your baby, leading to weak effort and shorter feeds

For more details, see this clinical breastfeeding protocol on ineffective suck used by public health experts in Toronto.

How Can You Tell If Your Baby Has a Weak Suck?

Here are some common signs:

• Feeds last a long time, but your baby still seems hungry
• Baby falls asleep after a few minutes at the breast
• Few wet diapers (less than 6 per day after the first week)
• Not gaining weight or if the baby is losing weight
• Noisy or clicking sounds while nursing
• Frustration or fussing at the breast
• Sore nipples caused by the baby’s hard palate rubbing due to poor suck
• Prolonged breast engorgement past the first week
• Baby cries when removed from the breast, but isn’t actively feeding

If you’re seeing a few of these consistently, it’s worth investigating further.

What Can You Do to Help?

Let’s get to the good stuff—practical steps you can take.

Recheck the Latch

Even if it looks okay, a small tweak can make a big difference. Try:

• Holding your baby closer so their chin presses into the breast
• Aiming your nipple toward the roof of their mouth
• Using the cross-cradle hold for better control
• Making sure your baby is awake and alert before latching

Try Breast Compressions

Gently squeeze your breast while your baby is sucking to encourage more milk flow. This can help keep them engaged and promote better milk transfer.

Use Skin-to-Skin Contact

Strip your baby down to a diaper, hold them against your bare chest, and let them nuzzle. This helps stimulate instinctive feeding reflexes.

Try Dangle Feeding for Better Flow and Drainage

This is a breastfeeding position where you lean over your baby so that gravity helps the milk flow downward into their mouth.

It can help babies who struggle with shallow latch or low muscle tone, and it can be especially useful if you’re dealing with breast engorgement or plugged ducts.

It might feel awkward at first, but some parents find it really effective during cluster feeding or when your baby seems too tired to nurse well in upright positions.

Stimulate Before Feeds

Try patting the outer edges of your baby’s lips or gently stroking their cheek to encourage alertness. Some parents also use a cool compress to firm the nipple before latching.

Suck Training and Nipple Shields

• Let your baby suck on a clean finger to encourage rhythm and strength
• A lactation consultant may recommend a nipple shield in certain situations, especially if the baby has low muscle tone.

Pump to Protect Your Supply

A weak suck can lead to poor breast drainage, but pumping after feeds helps protect your milk supply. Pumping will also prevent plugged ducts and engorgement.

Supplement When Needed

Using a Supplemental Nursing System (SNS) lets you provide extra milk—whether pumped breast milk or formula—while your baby is nursing at the breast. It helps your baby keep practicing their suck, supports your milk supply, and allows you to stay connected and close during feeding, even while supplementing.

Get a Lactation Consultant Onboard

An IBCLC (International Board Certified Lactation Consultant) can watch a feed and spot things you can’t see. They can also assess for tongue-tie or other oral issues.

Can You Prevent a Weak Suck?

Not all sucking problems can be prevented, but here are a few ways to reduce the risk:

• Avoid elective C-sections unless medically necessary (to reduce prematurity risk)
• Delay the use of artificial nipples or pacifiers until breastfeeding is well established
• Learn and practice proper latch techniques early
• Research shows that skin-to-skin contact improves latching success, especially in babies with early feeding issues.

When to Get Help

If you notice any of the following, it’s time to reach out to your pediatrician or lactation consultant:

• Weight loss or plateauing after the first few days
• Less than 6 wet diapers per day after day 5
• Baby consistently falls asleep at the breast
• You’re in pain or dread feedings
• Baby seems unsatisfied even after long feeds

Don’t wait. The earlier you get support, the better the outcomes.

Real Talk: You’re Not Failing

A weak suck can be frustrating, but it doesn’t mean that your breastfeeding relationship is doomed. Most babies improve with time, support, and sometimes a little extra help.

Studies show that breastfeeding challenges can impact maternal mental health, which makes getting support even more important.

Some babies just need a bit more coaching, practice, or therapy. Some need temporary supplementation while you figure things out. You’re still feeding with love—that matters most.

If you ever need a second opinion, more tips, or emotional backup, reach out. Lactation support is out there, and you don’t have to power through this alone.

Breastfeeding is a skill both you and your baby are learning. Get the support you deserve, and know that improvement is absolutely possible.

You’ve got this.

Resources

• Find a breastfeeding support group near you.
• Milkology Breastfeeding Class – Affordable, video-based online course to help you master breastfeeding at your own pace.