If your baby cries for hours on end and nothing seems to help, you are not doing anything wrong. You might be dealing with colic — one of the most exhausting and misunderstood challenges of early parenthood. The good news: it is temporary, it is not your fault, and there are things that can help.
What Colic Actually Is
Colic is defined by the "Rule of Threes": crying that lasts at least 3 hours a day, at least 3 days a week, for at least 3 weeks in a row, in an otherwise healthy baby. It typically starts around 2 to 3 weeks of age (or a bit later in premature babies) and peaks at about 6 weeks.
Roughly 1 in 4 babies meets the criteria for colic, though plenty more have fussy periods that come close. It affects boys and girls equally, breastfed and formula-fed babies alike, and firstborns at the same rate as younger siblings.
The crying tends to follow a pattern: it ramps up in the late afternoon or evening, the baby may pull their legs up, clench their fists, and turn red in the face. They look like they are in pain — and that is the part that breaks your heart.
What Causes Colic
The honest answer is that nobody knows for certain. Decades of research have narrowed it down to several theories, but none fully explain it:
- Immature digestive system. The gut is still learning to process food, and gas or discomfort may play a role. Some babies do seem to improve with gas drops or probiotic strains like Lactobacillus reuteri.
- Overstimulation. After a full day of sights, sounds, and sensations, some babies essentially "melt down" in the evening because their nervous system is overwhelmed.
- Gut microbiome differences. Studies have found that colicky babies sometimes have different gut bacteria than non-colicky babies, though it is unclear whether that is a cause or a side effect.
- Food sensitivities. In a small subset of breastfed babies, maternal diet (especially dairy) may contribute. Switching formula to a hydrolyzed version helps some formula-fed babies.
- Tobacco exposure. Babies of mothers who smoked during pregnancy or who are exposed to secondhand smoke have higher rates of colic.
What colic is not: it is not caused by bad parenting, a stressful pregnancy, or anything you did or did not do.
Soothing Techniques That Actually Help
No single technique works for every colicky baby, but the 5 S's, popularized by Dr. Harvey Karp, are the closest thing to a universal toolkit:
- Swaddle. A snug swaddle mimics the womb and can calm the startle reflex. Use a thin blanket or a velcro swaddle sack. Stop swaddling once your baby shows signs of rolling.
- Side or stomach position. Hold your baby on their side or tummy across your forearm (the "colic carry"). This is for soothing only — always place them on their back to sleep.
- Shush. Loud, rhythmic shushing near the ear mimics the whooshing sound of blood flow in the womb. A white noise machine works well too. The volume should match or slightly exceed the crying — a quiet "shh" from across the room will not cut it.
- Swing. Gentle, rhythmic motion — rocking, bouncing on a yoga ball, a car ride, or a baby swing. The movement should be small and jigly, supporting the head at all times.
- Suck. Offer a pacifier, a clean finger, or the breast. Non-nutritive sucking is deeply calming for newborns.
Other strategies worth trying:
- A warm bath during fussy periods
- Infant massage, especially circular motions on the belly
- Carrying your baby in a wrap or carrier — movement plus closeness is powerful
- Switching to a slow-flow bottle nipple to reduce air swallowing
- Bicycle legs to help move gas along
- Dimming the lights and reducing stimulation in the evening
When to Call the Doctor
Colic is a diagnosis of exclusion, meaning your pediatrician needs to rule out other causes of crying first. Call your doctor if:
- Your baby has a fever, vomiting, or diarrhea
- There is blood in the stool
- Your baby is not gaining weight
- The crying is truly inconsolable and different from their usual fussiness
- You notice any signs of pain, such as arching the back persistently
- The crying started suddenly after a fall or injury
Your pediatrician can also check for conditions that mimic colic, like reflux, milk protein allergy, or a hair tourniquet (a strand of hair wrapped tightly around a finger or toe — more common than you would think).
The Impact on Parents
Let us talk about the part that does not get enough attention: colic is brutal on parents. Studies show that parents of colicky babies have significantly higher rates of postpartum depression, anxiety, and relationship strain. The relentless crying can make you feel like a failure, even though you are doing everything right.
Some things to remember:
- Put the baby down and walk away if you need to. A baby crying safely in a crib for five minutes while you take deep breaths in another room is infinitely better than a frustrated parent reaching their breaking point. This is not neglect — it is good judgment.
- Tag team. If you have a partner, take shifts. Thirty minutes on, thirty minutes off. Wear earplugs or noise-canceling headphones during your off shift if needed.
- Ask for help. A grandparent, friend, or postpartum doula who can hold the baby for an hour so you can shower, sleep, or just sit in silence is a lifeline, not a luxury.
- It does not mean you are failing. Colicky babies cry regardless of who is holding them. The world's most experienced neonatal nurse would struggle too.
It Does End
This is the most important thing to know: colic almost always resolves on its own by 3 to 4 months of age. For most babies, there is a noticeable improvement around 8 to 10 weeks, and by 12 to 16 weeks, the extended crying episodes are gone. It does not taper off gradually for most families — one week you are in the thick of it, and the next week you realize the screaming hour just... did not happen.
Looking back, most parents describe the colic period as the hardest weeks of their lives — and also the fastest to fade from memory once it is over. You will get through this. Your baby will get through this. And the bond you are building by showing up night after night, even when nothing works, is stronger than you know.
Track your baby's fussy periods, feeding changes, and soothing strategies with Evo — spotting patterns can help you and your pediatrician find what works.