Growth Spurts in Babies and Toddlers: Signs, Timeline, and What to Expect

Your baby, who was sleeping beautifully and eating on a predictable schedule, is suddenly ravenous every two hours, clingy, fussy, and waking up at night again. Before you panic, there's a good chance you're in the middle of a growth spurt — one of the most disruptive but completely normal phases of infant and toddler development.

When growth spurts typically happen

Growth spurts tend to cluster around predictable ages, though every baby varies: 7-10 days, 2-3 weeks, 4-6 weeks, 3 months, 4 months, 6 months, 9 months, and 12 months. Toddlers have less predictable spurts but may go through noticeable ones around 18 months and 2 years. Each spurt usually lasts 2-7 days. They're brief but intense.

Signs of a growth spurt

Increased hunger. Wanting to eat more frequently and taking larger feeds. Breastfed babies may cluster feed — nursing every hour or two instead of their usual pattern. Formula-fed babies may drain bottles faster or want extra ounces. Sleep disruption. Waking more at night, fighting naps, or conversely, sleeping more than usual (growth hormone is released during sleep, so extra sleep is productive). Fussiness and clinginess. The discomfort of rapid growth, combined with hunger and tiredness, makes for a cranky baby. Developmental bursts. Growth spurts often coincide with new skills. Your baby may suddenly roll, babble more, or reach for things they couldn't before.

How to handle it

Feed on demand. If they're hungry, feed them. During a growth spurt, your baby's caloric needs have temporarily increased. For breastfeeding mothers: the increased demand stimulates increased supply. It feels like you're not making enough, but your body adjusts within 24-48 hours. This is not a sign you need to supplement. Maintain sleep routines. Even though sleep is disrupted, keep the routine consistent. The spurt will end and you want your foundation intact. Give extra comfort. More holding, more cuddling, more responsiveness. Your baby needs you more right now and that's okay. Take care of yourself. Growth spurts are exhausting for parents too. Accept help, lower expectations, and know this is temporary.

Toddler growth spurts

Toddler spurts are less about constant feeding and more about appetite fluctuations and growing pains. Your toddler may eat everything in sight for a few days, then barely eat for a week. They may wake at night complaining of leg pain (classic growing pains — real, harmless, and helped by gentle massage or a warm compress). Their clothes may suddenly not fit.

Growth spurts are temporary disruptions to your routine, not permanent changes. Feed on demand, comfort generously, maintain your sleep structure, and wait it out. Normal service will resume within a week.

Your baby was sleeping beautifully and eating predictably. Then suddenly they're ravenous every hour, won't be put down, and sleep has gone haywire. Before you panic: it might be a growth spurt.

When growth spurts happen

Growth spurts commonly occur around 7-10 days, 2-3 weeks, 4-6 weeks, 3 months, 4 months, 6 months, 9 months, and 12 months. In toddlers, they become less predictable but still occur periodically through age 3.

Lampl and Johnson's research (2011) in Sleep found a fascinating connection: infant growth in length follows periods of prolonged sleep. Babies who slept more and napped more frequently had measurable growth episodes — confirming that the increased sleepiness many parents notice isn't coincidental.

Related: When Babies Sleep Through the Night | Breastfeeding Complete Guide