Senses: Your newborn's eyesight is around 20/400 (perfect vision is 20/20), so things look pretty fuzzy. She can see just 30 inches ahead and prefers to focus on objects that are even nearer, so get up close! She not only recognizes your smell but prefers it above others. And she loves hearing your voice, so talk to her, sing songs, and if you hear her make a sound, join her in a "conversation."
Body: Hands are mostly clenched in little fists, and legs are bunched up like they were in the womb. The grasping reflex makes your baby hold tight to your fingers.
Brain: Your baby was born with a whopping 100 billion neurons (cells that make up the brain and nerves).
Communication Skills: It's all about crying -- three hours a day, give or take, but it can seem like 24-7. The trick is trying to figure out what she needs. Soon enough, you'll be a pro at knowing just how to comfort her.
Aww Factor: "Hey, Sweet Pea!" -- your baby recognizes your voice and may turn her head in your direction.
Fave Toy: Your hair -- so fun to pull, twist, and coil fingers in. (Ponytails are a mom's best friend.)
Playtime: The silly-face game. Your baby is a rapt audience of one -- when she's looking at you intently, open and close your eyes, stick out your tongue, smile. That's entertainment!
Senses: Your touch is healing. Research suggests that infant massage may boost weight gain, immune function, and muscle development, and ease colic and tummy aches. Do a lot of hugging, holding, caressing, and kissing.
Body: As his neck control improves, your newborn will be able to keep his head up when you hold him in a sitting position. His hands also start to unfold. And he's packing on as much as half a pound a week.
Brain: During half the hours your baby is asleep, he's in the REM cycle, when dreaming occurs. Scientists believe infants use this time to process the mounds of information they absorb during the day.
Communication Skills: Is there a dove in the house? Nah, it's just your baby, who has started to coo. You're beginning to notice his emerging temperament -- is he a quiet thinker? A feisty little guy?
Aww Factor: His favorite spot for a catnap is curled up on your chest.
Fave Toy: A mobile. He's fascinated by its shapes and movements.
Playtime: Monkey see, monkey do. Imitating your baby's sounds and expressions is a fun way to communicate.
Mealtime: By this point, infants instinctively know how much they need to eat to grow, so as long as your baby seems content, stop stressing about over- or underfeeding him.
Senses: Eye coordination has improved so much that your baby can now easily follow an object through a 180-degree arc. That means playtime is more fun and dynamic -- patty-cake, anyone?
Body: When lying on her stomach, your little one peels her chest off the ground and lifts her head up 45 degrees (in yoga, this is aptly called Baby Cobra).
Brain: Your baby's burgeoning understanding of the world is based on predictable patterns, so when you stray from your normal routine -- traveling to visit family or staying out later than usual -- she may act upset or unsettled.
Communication Skills: It's ooh and aah time as your newborn begins making vowel sounds.
Aww Factor: That first amazing smile turns you into a big puddle of mush.
Fave Toy: A rattle. Your baby loves grasping objects and exploring sounds.
Playtime: Sing-along. Now that your baby is more responsive, she'll whoop with glee at your off-key performance.
Senses: As a newborn, he would only respond to black and white and high-contrast colors. He can now distinguish all the shades of the rainbow.
Body: Your baby is starting to sit with the support of his hands or a pillow. He's also beginning to reach out for objects.
Brain: He's becoming more aware of his surroundings and connecting the sight of things with pleasure -- his mother's face with warmth, the breast or bottle with nourishment.
Communication Skills: Cries are now more deliberate. He may pause between sobs to see whether you're coming to the rescue. He may also cough or squeal to elicit a response.
Aww Factor: Your little one has started giggling, and all is good in your world.
Fave Toy: Bubbles! He'll get a kick out of watching them float through the air.
Playtime: Lay out a playmat or a blanket and scatter toys around. Get down on his level and encourage him to reach out and start rolling or inching toward them.
Months 5 & 6
Senses: Infants are born with a sweet tooth, but by this stage, they've also developed an appreciation for salty tastes, just in time for introducing solids.
Body: Big news! Your baby rolls front to back and probably vice versa, and can sit like a tripod, propped up with one arm.
Brain: She begins to understand the concepts of putting in and taking out.
Communication Skills: By 6 months, babbling begins to imitate speech in tone and pattern. It also becomes language-specific, so a French baby (oui-oui) and an American baby (wah-wah) will start to sound different when they jabber.
Aww Factor: She can see you from across the room now and will probably react with a big smile.
Fave Toy: Plush ball. She's starting to learn how to transfer objects from hand to hand.
Playtime: "Tell me a story." She can focus her eyes and attention better, so make reading a part of your daily routine.
Mealtime: Add cereal, bananas, and other appropriate, easy-to-mush food to your shopping list. The tongue-thrust reflex subsides; your child is now ready to gum and chew soft solids.