At six weeks old, your baby is right in the middle of a major transition. The sleepy newborn phase is fading, and you’re starting to see a more alert, expressive little person emerge. This is also, honestly, one of the hardest weeks for many parents, because crying tends to peak right around now. Here’s what’s actually happening with your baby at this stage and what the next few weeks look like.
Growth and Weight Gain
In these early months, babies gain about one ounce per day and grow roughly one inch per month. By six weeks, most babies have regained their birth weight and then some. A baby who weighed 7.5 pounds at birth might now weigh around 9 to 10 pounds, though there’s a wide range of normal.
You’ll probably notice that your baby’s face is filling out, their thighs are getting rounder, and their newborn clothes are starting to feel snug. Growth at this age isn’t perfectly steady. Babies go through growth spurts where they feed more intensely for a day or two, then settle back into their usual pattern. If you’re in the middle of one of these, the constant feeding is temporary.
The First Real Smile
Six weeks is prime time for one of the most rewarding milestones: the social smile. Unlike the reflexive smiles you may have seen in the first few weeks (often during sleep), a social smile is intentional. Your baby sees your face, processes it, and smiles back at you. Most babies develop this skill by the end of their second month, so if it hasn’t happened yet, it’s likely just days away.
Along with smiling, your baby is starting to coo and make small vowel-like sounds. They may wriggle or kick when they see you, their way of communicating excitement before they have words. Some babies aren’t ready to hold eye contact for long stretches yet. If yours tends to look just past your face rather than directly into your eyes, that’s normal. They’re still absorbing your voice, your touch, and your expressions, and they’ll hold their gaze longer with practice.
Crying Hits Its Peak
Here’s the part nobody loves hearing: six weeks is typically when crying reaches its highest point. This falls within what’s sometimes called the PURPLE crying period, which starts around two weeks of age and doesn’t fully taper off until three to five months. During the peak, which lands squarely in the second month of life, it’s not uncommon for babies to cry five hours a day or more.
What makes this phase so frustrating is that the crying often has no clear cause. Your baby is fed, dry, and comfortable, and they’re still crying. It tends to cluster in the late afternoon and evening, and it can resist every soothing technique you try. This isn’t a sign that something is wrong with your baby or that you’re doing something wrong. It’s a neurological phase that virtually all babies go through, and it does end. The intensity starts declining noticeably after the second month.
Sleep at Six Weeks
Your baby is sleeping around 16 hours a day, split roughly in half between daytime and nighttime. That sounds like a lot, but it comes in short bursts. About half of their sleep is active (REM) sleep, which is why you’ll see twitching, fluttering eyelids, and irregular breathing that can look alarming but is completely normal.
Most six-week-olds are not sleeping through the night, and you shouldn’t expect them to. Babies typically don’t manage a six-to-eight-hour uninterrupted stretch until at least three months of age, or until they weigh 12 to 13 pounds. At six weeks, a “good” night usually means one longer stretch of three to four hours followed by shorter ones. You may start noticing the very beginnings of a day-night pattern forming, with slightly longer sleep periods happening at night, but a predictable schedule is still weeks away.
Feeding Frequency and Volume
If you’re formula feeding, your baby is likely taking 3 to 4 ounces per feeding every three to four hours, adding up to roughly 24 to 32 ounces in a day. A useful rule of thumb: babies need about 2.5 ounces of formula per pound of body weight daily. So a 10-pound baby would need around 25 ounces spread across the day.
Breastfed babies typically eat smaller amounts more frequently, sometimes every two to three hours. Because you can’t measure what’s going in, diaper output is your best gauge. At six weeks, you should see at least six wet diapers in 24 hours. Bowel movements often slow down around this age. While a younger newborn might poop after every feeding, a six-week-old may go once a day or even once every few days, particularly if breastfed. As long as the stool is soft when it does come, that’s fine.
What Your Baby Can See
Your baby’s vision is still developing. They can focus best on objects 8 to 12 inches away, which happens to be roughly the distance between your face and theirs during feeding. High-contrast patterns (black and white, bold stripes) are the easiest for them to see. They’re beginning to track moving objects with their eyes, though this skill won’t be fully reliable until around three months. Faces are by far the most interesting thing in their visual world right now.
Tummy Time
By six weeks, your baby should be getting some supervised tummy time each day. The goal at this age is 15 to 30 minutes of total tummy time daily, broken into short sessions of three to five minutes each. Two or three sessions a day is a good starting point. Your baby will probably protest. That’s expected. Tummy time is hard work for a baby whose neck and shoulder muscles are still weak. Getting down on the floor face-to-face with them, or placing them on your chest while you recline, can make it more tolerable. Even brief sessions build the strength they’ll need for rolling over and eventually crawling.
The Two-Month Checkup
Your baby’s next well-child visit is typically scheduled around two months, so it’s coming up soon. This appointment includes the first round of childhood vaccinations. Your baby will receive doses protecting against rotavirus, diphtheria, tetanus, whooping cough, a type of bacterial meningitis, pneumococcal disease, and polio. It’s a lot for one visit, and your baby will likely be fussy afterward. Some babies run a low fever or are sleepier than usual for a day or two.
This visit is also a good time to bring up anything that’s been worrying you, whether it’s the intensity of crying, feeding difficulties, or your own recovery. Your pediatrician will measure your baby’s weight, length, and head circumference and plot them on a growth chart. What matters most isn’t where your baby falls on the chart but that they’re following a consistent growth curve over time.
What the Next Few Weeks Look Like
The six-week mark often feels like a low point for parents because the crying is at its worst, sleep deprivation is cumulative, and the baby isn’t yet giving back much socially. That changes fast. Over the next two to four weeks, the crying begins to ease, your baby becomes more interactive, and those social smiles start coming more frequently. Many parents describe the shift from six weeks to ten weeks as the period where things finally start to feel manageable. You’re in the thick of it right now, but the hardest stretch is nearly over.