Toddler and Preschooler Behavior by Age: A Guide From 1 to 5
Every stage from the first birthday to kindergarten brings new skills and new challenges. This guide shows what is typical at each age, why it happens, and how your response should change as your child grows.
What parents should know
- Tantrums are reported in about 87% of children at 18 to 24 months, 91% at 30 to 36 months, and 59% at 42 to 48 months.
- Daily tantrums fall from about 20% of 2-year-olds to 10% of 4-year-olds.
- Most tantrums are short: 75% last 5 minutes or less.
- Discipline should grow with your child: redirection at 1, routines and choices at 2, simple rules at 3, reasons and problem-solving at 4, and responsibilities at 5.
- Sleep needs drop from 11 to 14 hours at ages 1 to 2 to 10 to 13 hours at ages 3 to 5.
- CDC milestones list what 75% of children do by each age, so a missed milestone is a reason to ask, not to wait.
Behavior at a glance, ages 1 to 5
This table summarizes the CDC milestones, tantrum research, and AAP and CDC parenting guidance covered in each age guide below.
| Age | Typical behavior | Why it happens | What works best | Sleep per 24 hours |
|---|---|---|---|---|
| 1 year | Throwing, dropping, climbing, biting, clinging, first tantrums | Mobility and curiosity outpace judgment; few words | Redirection, child-proofing, short limits, praise | 11 to 14 hours |
| 2 years | Daily tantrums, "no" and "mine," not sharing, hitting | Independence outpaces language and self-control | Routines, two choices, transition warnings, calm follow-through | 11 to 14 hours |
| 3 years | Arguing, whining, bossiness, new fears, fewer but louder tantrums | Language for negotiating; uneven self-control; booming imagination | A few positive rules, show what to do instead, calm-down plan | 10 to 13 hours |
| 4 years | Testing rules, potty talk, tall tales, friend conflicts | Learning that others think differently; testing power of words | Explain the reason, offer choices, coach conflict-solving | 10 to 13 hours |
| 5 years | Back talk, sore losing, after-school meltdowns, rule enforcing | Wanting to be big; school demands a lot of self-control | Minimal attention to back talk, responsibilities, logical consequences | 10 to 13 hours |
How tantrums change with age
Tantrums are the behavior parents ask about most, and the research gives a clear picture. In studies by Potegal and Davidson, tantrums were reported in 87% of children aged 18 to 24 months, 91% of those aged 30 to 36 months, and 59% of those aged 42 to 48 months (J Dev Behav Pediatr, 2003). StatPearls estimates that about 20% of 2-year-olds, 18% of 3-year-olds, and 10% of 4-year-olds have a tantrum every day (StatPearls).
Most tantrums are brief. In a study of 335 children aged 18 to 60 months, the most common duration was 30 seconds to 1 minute, and three-quarters ended within 5 minutes (Potegal, Kosorok and Davidson). Tantrums lasting 15 minutes or more at least three times a week are much less common, affecting about 5% to 7% of children aged 1 to 3.
How discipline should change as your child grows
The AAP's policy statement on effective discipline applies at every age: teach with positive reinforcement, set limits, redirect, and avoid spanking and harsh verbal punishment, which increase aggression over time. What changes is how much your child can understand and do.
Age 1: change the environment
Child-proof, redirect, and save "no" for safety. Your child understands "no" but cannot yet stop themselves.
Age 2: prevent and stay calm
Predictable routines, warnings before transitions, two acceptable choices, and calm follow-through. Short time-outs or time-ins can start to work.
Age 3: teach the replacement
A few rules stated positively ("gentle hands"), showing what to do instead, and practicing calm-down strategies when everyone is calm.
Age 4: give the reason
Briefly explain why, offer choices, use logical consequences, and coach children to solve conflicts with friends.
Age 5: build responsibility
Make rules together, give chores, follow through on consequences, and give back talk little attention while praising respectful requests.
Milestones to watch at each age
The CDC and AAP updated the milestone checklists in 2022 so that each item reflects what at least 75% of children do by that age (Zubler et al.). Some social and emotional milestones closely tied to behavior:
- 1 year: plays pat-a-cake, waves bye-bye, understands "no."
- 18 months: moves away but checks that you are close, points to show you something.
- 2 years: notices when others are hurt or upset, uses two-word phrases.
- 3 years: calms within 10 minutes after you leave, joins other children to play.
- 4 years: comforts others, changes behavior based on setting, likes to help.
- 5 years: follows rules and takes turns in games, does simple chores.
Sleep and behavior
Tired children have less self-control at every age. The American Academy of Sleep Medicine, with AAP endorsement, recommends 11 to 14 hours of sleep per 24 hours for ages 1 to 2 and 10 to 13 hours for ages 3 to 5, including naps (AASM). If behavior suddenly gets harder, look at sleep first. Our guide to toddler bedtime battles can help.
When to get help
Trust your instincts. You know your child best. Talk to your pediatrician if your child loses skills at any age, misses milestones for their age, has tantrums with the patterns described above, or if behavior is making daily life very hard for your family. Children under 3 can get a free evaluation through their state's early intervention program, and children 3 and older through the local public school district.
Frequently asked questions
At what age are toddler tantrums worst?
Tantrums usually peak between ages 2 and 3. Research found tantrums in about 91% of children aged 30 to 36 months, and about 20% of 2-year-olds have one daily. They typically become less frequent after age 3.
When do toddlers stop having tantrums?
Most children have far fewer tantrums by ages 4 and 5. Research found tantrums in about 59% of children aged 42 to 48 months, and daily tantrums fall to about 10% at age 4.
What is the best discipline for toddlers?
The AAP recommends positive reinforcement of good behavior, clear and consistent limits, redirection, and age-appropriate consequences. It advises against spanking and harsh verbal discipline at any age.
How do I know if my child's behavior is not normal?
Talk to your pediatrician if your child loses skills, misses CDC milestones for their age, or has tantrums that regularly last more than 25 minutes, involve self-injury, or include aggression toward caregivers in most episodes.
Is the terrible twos or threenager stage harder?
It depends on the child. Tantrums are most frequent around 2, while 3-year-olds have more words to argue and negotiate. Both are normal stages of growing independence.
Keep reading
Sources
This guide was checked against the current guidance below. Medical and safety recommendations can change; use the linked source and your child's clinician for decisions specific to your family.
- CDC Learn the Signs. Act Early.: Important milestones by 1 year
- CDC Learn the Signs. Act Early.: Important milestones by 2 years
- CDC Learn the Signs. Act Early.: Important milestones by 3 years
- CDC Learn the Signs. Act Early.: Important milestones by 4 years
- CDC Learn the Signs. Act Early.: Important milestones by 5 years
- Zubler JM, et al. Evidence-informed milestones for developmental surveillance tools. Pediatrics. 2022;149(3):e2021052138
- Potegal M, Davidson RJ. Temper tantrums in young children: 1. Behavioral composition. J Dev Behav Pediatr. 2003;24(3):140-147
- Potegal M, Kosorok MR, Davidson RJ. Temper tantrums in young children: 2. Tantrum duration and temporal organization. J Dev Behav Pediatr. 2003;24(3):148-154
- StatPearls: Temper Tantrums (NCBI Bookshelf)
- Belden AC, Thomson NR, Luby JL. Temper tantrums in healthy versus depressed and disruptive preschoolers. J Pediatr. 2008;152(1):117-122
- Sege RD, Siegel BS; AAP. Effective Discipline to Raise Healthy Children. Pediatrics. 2018;142(6):e20183112
- HealthyChildren.org (AAP): Top tips for surviving tantrums
- Paruthi S, et al. Recommended amount of sleep for pediatric populations: AASM consensus statement, endorsed by the AAP. J Clin Sleep Med. 2016;12(6):785-786