My Toddler's Behavior Changes During Growth Spurts
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, CDC, NIH guidelines
Last reviewed:
Your baby's physical development is unique, and concerns about my toddler's behavior changes during growth spurts, here is what you need to know.
The short answer
Growth spurts in toddlers can cause temporary behavior changes including increased hunger, extra sleepiness, fussiness, and clinginess. These episodes typically last a few days to a week and are a normal part of development. Growth spurts are less predictable in toddlers than in babies but may occur every few months.
Key takeaways
- Growth spurts in toddlers can cause temporary behavior changes including increased hunger, extra sleepiness, fussiness, and clinginess. These episodes typically last a few days to a week and are a normal part of development. Growth spurts are less predictable in toddlers than in babies but may occur every few months.
- Usually normal when: Increased hunger and fussiness lasting a few days.
- Call your doctor if: Behavior changes are accompanied by fever, weight loss, or developmental regression.
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to AAP, CDC, NIH guidelines, growth spurts in toddlers can cause temporary behavior changes including increased hunger, extra sleepiness, fussiness, and clinginess. These episodes typically last a few days to a week and are a normal part of development. Growth spurts are less predictable in toddlers than in babies but may occur every few months. At 12-18 months, growth spurts may occur every 2-3 months. Your toddler may eat voraciously for a few days, sleep more, and be clingier. Some parents notice their child's shoes or clothes suddenly seem too small. These are temporary phases. It is generally considered normal when increased hunger and fussiness lasting a few days. However, you should contact your pediatrician promptly if behavior changes are accompanied by fever, weight loss, or developmental regression.
Normal vs. Concerning
By Age
What to expect by age
12-18 months
Growth spurts may occur every 2-3 months. Your toddler may eat voraciously for a few days, sleep more, and be clingier. Some parents notice their child's shoes or clothes suddenly seem too small. These are temporary phases.
18-24 months
Growth spurts continue but overall growth rate slows compared to infancy. Your toddler may go through periods of increased appetite followed by periods of pickier eating. Both patterns are normal.
2-3 years
Growth spurts become less frequent but can still cause temporary behavior changes. Growing pains (leg aches at night) may begin during this period. Offering extra nutritious snacks during high-appetite periods supports healthy growth.
3-4 years
Growth continues at a steady pace with occasional spurts. By this age, children typically gain about 4-5 pounds and 2-3 inches per year. Behavior changes during growth spurts are usually mild.
What to Tell Your Pediatrician
- Describe when you first noticed my toddler's behavior changes during growth spurts and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if behavior changes last more than 2 weeks.
- Mention if your toddler has persistent pain or discomfort.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Increased hunger and fussiness lasting a few days.
- Your toddler sleeps more than usual for a short period.
- Behavior returns to normal within a week.
- Your toddler is otherwise healthy.
- Behavior changes last more than 2 weeks.
- Your toddler has persistent pain or discomfort.
- Appetite changes are extreme and prolonged.
- Behavior changes are accompanied by fever, weight loss, or developmental regression.
- Pain is severe or interferes with walking or sleep.
What You Can Do at Home
- Keep track of when you notice my toddler's behavior changes during growth spurts — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that increased hunger and fussiness lasting a few days — this is generally within the range of normal.
- At 12-18 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Provide plenty of supervised floor time and tummy time to support your baby's physical development.
- While monitoring at home, seek immediate care if behavior changes are accompanied by fever, weight loss, or developmental regression.
Related Conditions
Related Resources
Milestone Checklists by Age
Track your baby's developmental milestones from birth to 5 years with age-specific checklists.
Growth Percentile Calculator
Plot your baby's weight, length, and head circumference on WHO/CDC growth charts.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is my toddler's behavior changes during growth spurts normal?
When should I call the doctor about my toddler's behavior changes during growth spurts?
When is my toddler's behavior changes during growth spurts normal?
What causes my toddler's behavior changes during growth spurts?
What should I mention to my pediatrician about my toddler's behavior changes during growth spurts?
Is my toddler's behavior changes during growth spurts normal at 12-18 months?
Is my toddler's behavior changes during growth spurts normal at 18-24 months?
Should I go to the ER for my toddler's behavior changes during growth spurts?
Does my toddler's behavior changes during growth spurts go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss My Toddler's Behavior Changes During Growth Spurts.
Things to mention
- Describe when you first noticed my toddler's behavior changes during growth spurts and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if behavior changes last more than 2 weeks.
- Mention if your toddler has persistent pain or discomfort.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Behavior changes last more than 2 weeks.
- Your toddler has persistent pain or discomfort.
- Appetite changes are extreme and prolonged.
Urgent signs to report immediately
- Behavior changes are accompanied by fever, weight loss, or developmental regression.
- Pain is severe or interferes with walking or sleep.
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
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Related Resources
Bottom line
Most cases of my toddler's behavior changes during growth spurts are normal. Talk to your pediatrician if behavior changes are accompanied by fever, weight loss, or developmental regression.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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