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A toddler is a child between the ages of one and three years old, although some may consider a toddler to be between two and five. During this period, the child learns a great deal about social roles and develops motor skills; to toddle is to walk unsteadily.

The toddler developmental timeline shows what an average toddler can do at what age. Times vary greatly from child to child. It is not uncommon for some toddlers to master certain skills (such as walking) well before other skills (like talking). Even close siblings can vary greatly in the time taken to achieve each key milestone.

If a child is 'behind' in some areas, do not consider it a problem without first consulting with a professional.

Most children are toilet trained while they are toddlers.

Age	Physical	Mental	Emotional
12 - 15 Months	Stand alone well. Drink from a cup (poorly). Turn pages in a book (a few at a time). Play ball by rolling or tossing it.	Uses four to six words such as "ball", "cracker", or "cookie" Can follow a simple command with an associated gesture, such as: bringing a cup to you when you point at it and say "Please bring me the cup". Object Permanence: Realizes things still exist when they are out of sight, such as a toy block placed into a closed box.	Use gestures or words to convey desires, such as: Pointing a book, raising arms to be picked up, or saying "cup". Mimic actions such as covering eyes while playing peek-a-boo.
15 - 18 Months	Walk well alone. May be able to bend down and stand up without help. Hold a crayon well enough to scribble. Lift cup up to mouth for drinking. Climb onto furniture.	Uses 10-20 words. May be able to follow a command without a gesture. Stack 2 blocks.	Greet people with "hi". Mimic parental activities such as cleaning up or talking on a phone.
18 - 24 Months	Feed self with a spoon. Run. Climb into a small chair. Walk up steps.	Speaks 20-50 words; understands many more Stack 6 blocks Understands non-physical relationships such as turning on lights or pushing buttons. Sorting toys. Searching for hidden objects. Problem solving through experimentation.	Wants to be independent at times. Will throw a tantrum or possibly say no. Mimics social behavior such as hugging a teddy bear or feeding a doll. Self recognition. Self reference. Displays attachment. Separation anxiety. Can play turn taking games.
24 - 36 Months	Advanced mobility and climbing skills. Increased dexterity with small objects, puzzles. Able to dress oneself.	Speaking in sentences. Easily learns new words, places and people's names. Anticipates routines. Plays with toys in imaginative ways. Attempts to sing in-time with songs.	Knows boys from girls. Shows preferences, such as clothes and entertainment.

Even when toddlers can walk they are often transported in a buggy, or stroller when they are tired, or to increase speed.