Baby Growth Spurts: Signs, Timeline, and Tips

You just bought a 3-month-old onesie, and it already fits your baby like a body stocking! Another growth spurt? It certainly can feel that way. If it feels like your little one grew overnight, you may be wondering whether they’re going through a growth spurt. Baby growth spurts are short periods of rapid growth that can bring changes in sleep, feeding, and behavior.

Here’s what to expect during baby growth spurts, including when they typically happen, common signs to look for, and simple ways to support your baby through them.

Baby growth spurts are short periods when babies grow more quickly than usual. They commonly occur around 2 to 3 weeks, 6 to 8 weeks, 3 months, and 6 months, and can temporarily affect sleep, feeding, and behavior.^6,7,14,15,16

How Do Baby Growth Spurts Work?

Baby growth spurts are short periods when babies grow more quickly than usual.^6,7 Instead, babies grow in “spurts” throughout the first year of life and beyond.^6,7 Babies grow at very different rates, typically losing 10% of their body weight in the days immediately after they’re born, then gaining weight at an average rate of 2⁄3 of an ounce (about 20-30 grams) per day.^1,5

They typically grow between 1 1⁄2 and 2 inches during their first month. Many babies grow so much during their first year that their weight roughly triples by age 1.⁷ Also, boys usually weigh a little more and tend to be somewhat longer than girls at this age.¹

Related: Baby Milestones Month by Month

Do Growth Spurts Hurt Babies?

Growth spurts do not usually hurt babies, but they may be more fussy, tired, or unsettled than usual.⁶ They may want extra comfort, sleep, or feeds during this short phase. If you suspect something else is going on, such as teething, an ear infection, or another illness, trust your instincts and contact your child’s healthcare provider.^6,8

Some research shows that babies have a higher incidence of illness during or immediately after a growth spurt due to reduced immunity.³ Keeping your baby’s routine as consistent as possible and continuing to offer breast milk, formula, or nutrient-rich foods as appropriate may help support their overall health during this time.⁹

Related: Creating Your Baby’s Schedule: Tips and Sample Routines

Signs of a Baby Growth Spurt

Baby growth spurts usually last up to 3 days in babies and up to a week in older children.⁶ During that time, you may notice changes in your baby’s sleep, feeding, and behavior. You might also notice those tiny onesies suddenly fitting a little tighter. Here are some common signs to look for:

1. Sleep

One common sign of a growth spurt is a change in sleep. Research shows that babies may sleep up to four additional hours one to two days before or during a growth spurt.⁴ You may notice longer naps, deeper sleep, or both. Human growth hormone (HGH), which supports healthy growth, is released during sleep.^10,11

Research has also linked infant growth with longer sleep and more frequent naps.² Some babies, however, may sleep less during a growth spurt. They may seem more restless, wake more often, or take shorter naps.¹²

Related: How Many Hours of Sleep Does Your Baby Need?

2. Behavior Changes

Your baby may latch during breastfeeding and bottle-feeding, then unlatch and fuss in between. You may also notice that your baby’s behavior changes during a growth spurt, making them more fussy, clingy, or harder to settle. This could be due to less sleep or exhaustion from the energy required for growth.^6,13

3. Changes in Feeding

During a growth spurt, some babies want to feed more often or for longer stretches.^14,15,16 This is sometimes called a feeding spurt or a frequency day. Research is mixed on how closely feeding spurts and growth spurts are connected, but many parents notice a temporary increase in feeding.¹⁴

Some babies may want to breastfeed as often as every hour while they’re awake, with some feeding up to 16 times in a day.^14,15,16 Your baby may also wake more often during the night to feed. Because they’re waking more frequently, they may take shorter naps and seem a little more restless.¹²

Related: Frequent Night Waking With Your Breastfed Baby: What’s Normal

Baby Growth Spurt Timeline

Baby growth spurts can happen at different times, but many occur around 2 to 3 weeks, 6 to 8 weeks, 3 months, and 6 months.^14,15,16 Every baby develops at their own pace, so your little one may experience growth spurts on a slightly different timeline.

• Between two and three weeks
• Between six and eight weeks
• Three months
• Six months

How to Help Your Baby During a Growth Spurt

Baby growth spurts can be exhausting, especially when your baby wants to feed more often, sleep differently, or be held all day. If possible, ask your partner, a family member, or a trusted friend for help so you can shower, eat, rest, or step outside for a few minutes.

If you’re breastfeeding and your baby wants to nurse more often, your body will usually respond by making more milk as demand increases.^17,18 If you bottle-feed, continue following your baby’s hunger cues and talk with your pediatrician if you’re unsure how much your baby needs.

Whether you’re breastfeeding or bottle-feeding, remember to take care of yourself too. Drink plenty of water, eat nourishing meals, and rest whenever you can. Most baby growth spurts last only a few days, and before long, your little one will settle back into a more familiar routine. You may just find yourself shopping for the next size up a little sooner than expected.