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can turn head from side to side when prone; lifts head momentarily from bed

one month

actively holds rattle but will not reach for it

three months

vocalizes, distinct from crying

two months

locates sound by turning head to side and looking in same direction

three months

squeals aloud to show pleasure

three months

laughs aloud

four months

able to grasp objects voluntarily

five months

sits, leaning forward on both hands

seven months

sits steadily unsupported

eight months

begins to imitate sounds

six months

babbling resembles 1-syllable utterances-- ma, mu, da, di, hi

six months

briefly searches for dropped object (object permanence beginning)

six months

increasing fear of strangers; shows signs of fretfulness when parent disappears

seven months

produces vowel sounds and chained syllables-- baba, dada, kaka

seven months

cruises or walks holding onto furniture or with both hands held

eleven months

birth length increased by 50%

twelve months

searches for object even if it has not been hidden, but searches only where object was last seen

twelve months

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