context: By now, your baby may be smiling, laughing, and cooing. She's also growing fast. Her birth weight may have almost doubled. You'll probably have a lot of questions for your baby's doctor at this visit. Here's what to expect at your baby's 4-month checkup. Check your baby's weight, length, and head circumference Perform a physical exam of your baby Give your baby a 2nd round of vaccines ( DTa P, Hib, polio, PCV, and rotavirus) Is your baby rolling over one way yet? Is your baby able to push up onto his forearms and lift his head yet? Does your baby have good head control when upright? Is your baby cooing or babbling yet? Does your baby respond to loud noises? Does your baby follow an object with his eyes? When will my baby sit up? When will my baby start crawling? My baby drools a lot. Is he teething? Don't expect baby to sit up or crawl for at least 2 more months. Your baby may be able to roll from front to back soon. Your baby can probably grab objects, including your hair or earrings. Your baby can also put objects into his mouth, so be aware of choking hazards! Give your baby different textures to explore, like a wooden spoon or furry toy. Hold a toy in front of your baby so he can reach for it and grab. Read and sing to your baby a little each day. Your baby will love it! Is it too soon for my baby to eat solids? Should I cut back on nursing when my baby starts solids? Your baby must be able to sit up with support and hold his head and neck up properly before you start solids. Other readiness clues include drooling, mimicking eating by opening his mouth while watching you eat, and reaching for items on your plate. Try starting with an iron-fortified infant rice cereal mixed with breast milk or formula. Don't worry if baby only takes one to two spoonfuls. Be sure to use a small, baby spoon as baby's mouth is still very small. Your baby may push the spoon right back out with her tongue! This is normal at first. Expect to continue nursing or bottle-feeding through baby's first year. When should I baby-proof the house? What should I do first? If you haven't already, start child-proofing now. Babies can develop new skills overnight! When your baby pushes up on his hands, take down mobiles. Continue to put your baby on his back to sleep. Never leave your baby alone on a sofa or bed. He may be able to roll off soon. Don't leave small objects lying around that baby can put into his mouth and choke on. Put up safety gates around stairs and any other unsafe areas. Put your baby's crib at its lowest height. Be sure to move cleaning and other toxic products out of baby's reach. What can ease my baby's pain from teething? Teething may make your baby drool and become cranky and usually starts around 6 months of age. Rubbing your baby's gums with a clean finger may ease the pain. To relieve pain, let baby chew on a clean, wet washcloth that has been in the freezer for a half hour. NOTE: Make sure to supervise your baby. You may be feeling a little more relaxed now since you're beginning to understand your baby's reactions. Be sure to continue encouraging baby's development by playing peek-a-boo and making faces and different sounds. See how your baby responds.