Infant and Toddler Developmental Milestones: Birth to Age 3
We hear the term “milestones” all the time, and many parents wonder whether their child is developing at the “right” pace. But what does that really mean? Developmental milestones are functional skills and behaviors that most children (about 75% or more) demonstrate by a certain age.
It’s important to remember that all children develop at their own pace. Think of each child like a kernel of popcorn; it’s impossible to know which one will pop next, but with the right conditions and environment, they all eventually do. In the same way, children grow and develop in their own time and often excel in different areas.
Rather than comparing children to one another, milestones can be helpful guides for understanding how young children typically grow and learn. Below is a non-comprehensive list of developmental milestones you may notice as your child grows. If you ever have questions or concerns, it’s always a good idea to talk with your child’s caregivers or pediatrician.
Birth–6 Month Milestones
During the first six months of life, infants are learning how to interact with the world around them. Babies begin forming social connections by smiling at caregivers, making eye contact, and responding to familiar voices. They experiment with communication through cooing, babbling, and different cries.
At the same time, infants become increasingly curious about their surroundings. They begin tracking moving objects and exploring with their eyes and hands. Physically, they gain strength and coordination, gradually lifting their heads, pushing up during tummy time, rolling over, and beginning to sit with support. These early experiences lay the foundation for later learning and development.
6–12 Month Milestones
Between six and twelve months, infants become much more active explorers. Many babies begin sitting independently, crawling, pulling up to stand, and possibly taking their first steps toward the end of the first year.
Socially, they develop stronger attachments to caregivers and may show stranger anxiety or separation anxiety. Communication skills expand as babies babble more frequently, respond to their name, and begin to understand simple words such as “no” or “bye-bye.” During this stage, babies also begin to understand cause and effect, imitate simple actions, and look for objects that have been hidden (an early sign of object permanence).
12–18 Month Milestones
During the second year of life, toddlers become increasingly independent and curious. Many children are confidently walking and exploring their environment by climbing, pushing toys, and manipulating objects.
Language development begins to accelerate during this period. Toddlers may use gestures, point to communicate their needs, and begin saying several meaningful words. Socially, they often show affection toward familiar adults and may start engaging in simple pretend play, such as feeding a doll or imitating everyday routines. Cognitive development continues through exploration, experimentation, and learning how objects work.
18–24 Month Milestones
Between eighteen and twenty-four months, toddlers experience a noticeable burst in communication and independence. Vocabulary grows quickly, and many toddlers begin combining two words into simple phrases such as “more milk” or “mommy, come.”
Socially, toddlers often engage in parallel play; they begin playing alongside other children while still focusing mainly on their own activities. They also begin expressing preferences and emotions more clearly. Physically, toddlers become more coordinated, running, climbing, kicking balls, and walking up stairs with assistance. During this stage, children are also learning to follow simple directions and beginning to solve basic problems through trial and error.
2–3 Year Milestones
Between two and three years old, toddlers continue developing stronger language, social, and problem-solving skills. Vocabulary expands rapidly, and children begin speaking in short sentences and asking simple questions.
Socially, they become more interested in interacting with peers and may begin engaging in cooperative play, sharing toys, and showing empathy toward others. Cognitive development includes imaginative pretend play, completing simple puzzles, and beginning to understand concepts such as numbers, shapes, and categories. Physically, children gain confidence in their movements (climbing, jumping with both feet, pedaling a tricycle) and refining fine motor skills like stacking blocks or turning pages in a book.
How Quality Childcare Supports Development
High-quality early childhood programs provide environments that actively support children’s development through responsive caregiving, play-based learning, and language-rich interactions. Skilled teachers observe children closely, create engaging experiences, and support social, emotional, cognitive, and physical growth through everyday routines and play.
In nurturing environments, children are encouraged to explore, build relationships, communicate, and develop confidence as learners.
The first three years of life are a time of incredible growth and discovery. Supportive relationships and rich learning environments play a key role in helping children reach their developmental potential.
Interested in learning more about our infant and toddler program?
Sources:
Centers for Disease Control and Prevention (CDC). Developmental Milestones
American Academy of Pediatrics (AAP). HealthyChildren.org: Ages and Stages
Zero to Three. Early Development Resources
National Association for the Education of Young Children (NAEYC). Child Development
