The first few weeks of your baby’s life can feel like a whirlwind of feeding schedules, diaper changes, and sleep-deprived nights. But between the chaos, something incredible is happening—your baby is growing, learning, and developing right before your eyes. From the first intentional smile to the beginnings of head control, the 1 to 3-month window is filled with exciting milestones that mark the start of a lifelong journey.
Let’s take a closer look at the developmental changes you can expect to see during this fascinating early stage.
Between 1 and 3 months, most babies experience rapid physical growth. You’ll likely notice your little one gaining weight steadily—about 5 to 7 ounces per week—as well as growing in length and head circumference. Chubby cheeks, round bellies, and irresistibly soft thighs are common signs of healthy development.
But beneath the baby fat, major strength is building. By the end of the third month, your baby might be able to lift their head for short periods during tummy time. Neck and upper body muscles begin to strengthen, which lays the foundation for future milestones like rolling over and sitting up.
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