- Physical development. Watching your baby grow in size is part of the fun of being a new parent. Don't be alarmed if your newborn loses some weight shortly after birth. This weight usually is regained within 10 to 12 days. Most newborns gain about 4 oz (113 g) to 8 oz (227 g) a week and grow about 1 in. (2.5 cm) to 1.5 in. (3.5 cm) in the first month.
- Cognitive development. Cognition is the ability to think, learn, and remember. Your newborn's brain is developing rapidly. You promote healthy brain growth every time you interact in a positive way with your baby.
- Emotional and social development. Newborns quickly learn to communicate. They seek interaction with you and express how they feel with sounds and facial expressions. At first, instinctual behaviors, such as crying when uncomfortable, are your baby's ways to signal his or her needs. Soon your newborn starts to subtly communicate and interact with you. For example, your baby's eyes will track your movements. And his or her face will brighten when you cuddle and talk soothingly. Even at a few days old, your baby may try to mimic you sticking out your tongue.
- Language development. Your newborn is listening to and absorbing the basic and distinct sounds of language. This process forms the foundation for speech.
- Sensory and motor skills development. Newborns have all five senses. Your newborn quickly learns to recognize your face, the sound of your voice, and how you smell. Your newborn's sense of touch is especially developed, particularly around the mouth. Your baby also has a strong sense of smell. After a few days, your newborn hears fairly well and responds most noticeably to high-pitched and loud sounds. Your baby recognizes and prefers sweet tastes to those that are sour, bitter, or salty. Vision is developing quickly but is believed to be the weakest of the senses. Motor skills develop as your baby's muscles and nerves work together. Movements are mostly controlled by reflexes, such as the rooting reflex, which is when a newborn's head turns and his or her mouth "reaches" toward a touch. Hands are tightly fisted when the baby is alert.
blog content captured from WebMD.com