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    That personality is getting bigger. So are those muscles.

    A three month old infant looking sideways and smiling

    Your baby’s world right now

    (Tiny little) feats of strength.
    By month three, your newborn will probably begin developing a personality all his own. He also might be reaching for objects, smiling spontaneously, and turning in the direction of your voice. Now might be a good time to familiarize him with new toys, textures, and people.

    Your 3-month-old is working on strengthening his hand muscles, and in five to six months, he should be able to pick up toys. To help him along, put a rattle in his hand and gently tug on the big end. This can also help him strengthen his muscles.
    A three month old infant drinking from a milk bottle

    Your baby’s nutrition

    Food for thought:
    Let’s get a little science-y for a minute. Good nutrition, including appropriate amounts of both macronutrients (carbohydrates, lipids, and protein) and micronutrients (vitamins and minerals), is important for your baby's overall development, including his immune system and brain development. These nutrients help provide cell membrane structure, regulate metabolism, and supply energy. For example, most cells in the body, especially those in the brain, use the carbohydrate glucose as the primary source of energy. Here's a brief description of how some of these ingredients work.

    • Carbohydrates supply food energy for growth, body functions, and activity in addition to allowing protein and lipids to be used efficiently and normally.
    • Lipids supply more than twice the energy of carbohydrates or protein to power growth and functionality. Fatty acids are one of the most abundant lipids in our body; linoleic and alpha-linolenic fatty acids are considered essential because our body cannot make them. Linoleic and alpha-linolenic acids are building blocks for arachidonic acid (ARA) and docosahexaenoic acid (DHA), respectively. DHA and ARA are important for brain and eye development.
    • Proteins help develop, maintain, and repair new tissues throughout the body, including in the brain.
    • Vitamin E is a fat-soluble vitamin; an antioxidant that is found in cells of the human body, including those found in baby’s developing eyes and brain. It is important in protecting cells including baby’s developing eyes and brain. Vitamin E is essential for structure and function of the human nervous system, retina, and skeletal muscle. Common sources of vitamin E include oil-containing grains, fortified cereals, vegetable oils, plants, and vegetables.
    • 2’-FL Human Milk Oligosaccharide (HMO)* is a prebiotic previously only found in breast milk. Prebiotics feed the good bacteria in the gut, where 70% of the immune system is located. And unlike other formulas, Similac has 2’-FL HMO, an immune-nourishing prebiotic that circulates throughout the body.

    While breast milk is the best nutrition for your baby, if you choose to formula feed, Similac with 2’-FL HMO helps strengthen your baby’s immune system to be more like a breastfed infant’s. Similac Pro-Advance provides complete nutrition for your baby's first year and supports his immune system, and brain and eye development.

    *Not from human milk.
    †At significant levels.

    A three month old infant lying on a bed staring at toys in the air

    Your baby’s development

    Sleep patterns and tips at four months:
    • Your baby might be sleeping about 12 to 15 hours total every day, including naps.
    • He might start rolling over and waking himself up. If possible, give a few minutes to see if he will go back to sleep on his own.
    • Keep thick blankets, comforters, pillows, and stuffed toys out of the crib.

    Have questions about SIDS?
    Learn about SIDS at the American Academy of Pediatrics.

    Your baby is beyond compare.
    You shouldn’t be concerned if your baby does something later or earlier than your friend's children. In general, by the end of his third month, here are some developments you can start looking for:

    • The ability to hold his head up steadily
    • "Coo" and "goo" noises as well as other sounds
    • Interest in reaching for familiar objects
    • Focuses on closely held objects and follows them from side to side
    A mirror reflecting the face of a three month old infant

    Things to think about now

    Help your 3-month-old engage with his world.
    You might not realize it, but your 3-month-old is becoming aware of his surroundings. Help familiarize him in some simple ways:

    • Prop him up so he can watch what goes on around him.
    • Look in mirrors. Put a non-breakable metal or plastic baby mirror in the crib or playpen. Show him the mirrors around your home.
    • Rock him in a rocking chair or porch swing. As you hold him, talk softly and look into his eyes.
    • Have quiet times. Your baby needs some quiet time to babble, play, and explore his world, so turn off the radio, TV, or stereo.
    • Give him different textures to feel, such as stuffed animals, plastic toys, or pieces of terry cloth or rubber. (Be sure that the pieces are not too small and that they cannot be torn off and swallowed.)
    • Sing quietly to him before bed.
    Smiling mother carrying her four months old infant outside the house

    Next month’s developments

    Yakety-yak. She talked back!
    Month four may bring some laughing and basic speech. This is also the time to start learning how you can start strengthening her immune system.