Growth & Development of a 3 Month Old Infant

When a baby reaches three months old, many parents are delighted to find that the newborn who once did nothing but sleep and eat is finally beginning to display her unique personality.

  1. Size

    • The average three-month-old baby is 24 inches long and weighs 13 pounds, according to Your Baby Today, but it's perfectly normal for infants to be smaller or larger.

    Coordination

    • Around three months, infants begin using their arms and legs by bringing their hands together, reaching for and grasping objects, pumping their legs and bearing some weight on their legs when held in a standing position, says BabyCenter.

    Routine

    • With his nervous system rapidly maturing, a three-month-old baby's eating and sleeping habits are becoming more routine; he may sleep for longer stretches at night and eat at predictable times.

    Strength

    • When placed on her stomach, a three-month-old can lift her head and support her weight on her arms; she may also roll over when placed in this position.

    Comfort

    • Around three months, a baby begins to show signs that he prefers to be held by his mother, father, or another familiar person; he's likely to show signs of distress or agitation around new people.

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