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    BABY

    The Developmental Leap From Four Days to Four Months

    …it’s a lot more significant than you might think!

    Dr. Harvey Karp

    Written by

    Dr. Harvey Karp

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    ON THIS PAGE

    • Developmental Leaps in Sensory Abilities 
    • Developmental Leaps in Social Abilities 
    • Developmental Leaps in Motor Abilities 
    • Developmental Leaps in Physiological Characteristics 

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    At prenatal classes, I often asked expecting parents to list the differences between 4-day-olds and 4-month-olds. Many of the first-timers thought it was a silly question and would laughingly say, “Ha! Not much! They’re all little babies.” But the experienced parents would pipe up and say, “You have no idea!” 

    Newborns are beautiful, but their abilities are quite limited. Four-day-olds can barely coo or turn their heads to see who’s speaking. By contrast, 4-month-olds’ delicious smiles and glowing eyes reach out like a personal invitation. 

    Months and months may pass in our lives without a whole lot of change. But during the first four months of life, your baby will make amazing leaps in development. While all babies are unique and may not all hit milestones at the exact same time, here are some big leaps to expect between day four and month four: 

    Developmental Leaps in Sensory Abilities 

    At 4 days…

    • Focuses on faces 8 to 12 inches away
    • Loves looking at red things and light/dark designs
    • Begins to recognize your scent and the sound of your voice
    • Easily focuses on people across a room

    At 4 months…

    • Quickly turns head to see you or find out where a voice is coming from
    • Easily recognizes your face and starts noticing when someone is a stranger 

    Developmental Leaps in Social Abilities 

    At 4 days…

    • Watches you with interest, but doesn’t try to participate
    • Attracted to sounds (voices, shush, etc.)
    • Stares at faces or close objects
    • Struggles to imitate your facial expressions (such as sticking out your tongue)
    • Calmly looks around empty room

    At 4 months…

    • Waits for you to stop talking before taking a turn cooing
    • Prefers human voices, especially yours
    • Face brightens when you enter the room
    • Gives a huge grin when you smile
    • Likes company, gets upset when ignored 

    Developmental Leaps in Motor Abilities 

    At 4 days…

    • Often crosses eyes
    • Follows slow-moving objects with jerky eye movements
    • Little ability to reach and touch things
    • Struggles to get hand to mouth (rarely able to keep it there for more than a few seconds) 

    At 4 months…

    • No longer crosses eyes
    • Swiftly and smoothly follows things or people moving around a room
    • Getting better aim (may swing hand or pull off your glasses!)
    • Much better at finger-sucking, sometimes lasting a minute or more

    Developmental Leaps in Physiological Characteristics 

    At 4 days…

    • Hands and feet look blue from time to time
    • Body occasionally jolted by hiccups, jittery tremors, and irregular breathing
    • Little ability to lift head or roll

    At 4 months…

    • No longer gets blue hands and feet unless cold
    • Rarely hiccups, never tremors, and breathing is smooth and regular
    • Easily rolls over and lifts head high off mattress (watch out for falls off the bed!)

    These extraordinary weeks will speed by faster than you can possibly imagine! So enjoy cuddling and carrying your sweet newborn as you make the most of these months.

    Disclaimer: The information on our site is NOT medical advice for any specific person or condition. It is only meant as general information. If you have any medical questions and concerns about your child or yourself, please contact your health provider. Breastmilk is the best source of nutrition for babies. It is important that, in preparation for and during breastfeeding, mothers eat a healthy, balanced diet. Combined breast- and bottle-feeding in the first weeks of life may reduce the supply of a mother's breastmilk and reversing the decision not to breastfeed is difficult. If you do decide to use infant formula, you should follow instructions carefully.

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