Grunting Sounds in Newborns
The short answer
Grunting in newborns is very common and usually normal. Babies grunt during sleep as they learn to coordinate their breathing, and they grunt while straining to have a bowel movement (grunting baby syndrome or infant dyschezia). However, continuous grunting with every breath, especially if accompanied by other signs of breathing difficulty, requires immediate medical attention.
Parents everywhere have the same worry. You are doing the right thing by looking into it.
By Age
What to expect by age
Newborns are notoriously noisy sleepers, and grunting is one of the most common sounds they make. Grunting during sleep occurs as your baby's respiratory system matures and they learn to regulate breathing. Grunting while straining to pass a bowel movement (infant dyschezia) is also very common. Your baby's abdominal muscles are not yet strong enough to effectively push stool out, so they grunt, strain, and may turn red. This is normal as long as the stool is soft when it comes out. The key distinction is: occasional grunting is normal, but grunting with every breath can be a sign of respiratory distress.
Grunting during sleep and bowel movements remains common. Grunting baby syndrome typically resolves by 3-4 months as your baby learns to coordinate relaxing the pelvic floor while pushing with the abdomen. Sleep grunting also decreases as the respiratory system matures. If grunting seems to increase or is accompanied by changes in breathing pattern, consult your doctor.
Most grunting from infant dyschezia resolves by this age. Sleep-related grunting also decreases significantly. If grunting persists or increases, or if your baby seems uncomfortable, discuss with your pediatrician.
Occasional grunting during effort or play is normal. Persistent grunting with every breath at this age is not typical and should be evaluated for respiratory or other causes.
What Should You Do?
When to take action
- Grunting during sleep that comes and goes
- Grunting and straining during bowel movements with production of soft stools
- Baby has normal skin color, is feeding well, and has no difficulty breathing
- Grunting that stops when baby wakes up or finishes straining
- Grunting with bowel movements that seems to cause significant distress for more than 10-15 minutes
- Grunting is accompanied by hard stools or no stool production despite straining
- Sleep grunting seems excessive and keeps baby (or parents) from resting
- Continuous grunting with every breath, especially with nasal flaring, chest retractions, or belly breathing, which indicates respiratory distress
- Grunting with a fever, poor feeding, lethargy, or blue/gray color of the lips or skin
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
Related Medical Concerns
Straining and Grunting to Poop (Infant Dyschezia)
Straining, grunting, and turning red during bowel movements is very common in newborns and is called infant dyschezia. It occurs because babies are learning to coordinate relaxing the pelvic floor while bearing down with the abdomen. It is NOT constipation as long as the stool is soft. It typically resolves by 3-4 months.
Noisy Sleeping: Grunting, Snoring, and Squeaking
Newborns are notoriously noisy sleepers. Grunting, squeaking, snorting, cooing, and even brief pauses in breathing are all normal during newborn sleep. These sounds are caused by small nasal passages, immature breathing patterns, and active (REM) sleep. Most noisy sleeping resolves as baby grows.
Normal Noisy Breathing in Newborns
Newborns are notoriously noisy breathers. Squeaking, whistling, snorting, rattling, and gurgling sounds are very common and usually normal because babies have small, flexible airways and narrow nasal passages. As long as your baby is breathing comfortably, feeding well, and has normal skin color, noisy breathing is rarely a cause for concern.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.
Adenoid Hypertrophy and Breathing
Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.