Make sure your child is adequately warm or cool when in the child carrier. Dangling legs and feet are especially prone to get cold as are ears and little hands. While your child might be snug (and even getting overheated) in the carrier, their little feet can be aching. Socks, booties, mittens and a hat will all help. In warm weather the child carrier can make things uncomfortable. If you find you're drinking water don't forget the little person in back of you needs fluids too. Make sure that exposed skin is protected by infant sunscreen. Insect repellant shouldn't be applied to children under two, so check with your pediatrician before going into areas that would require repellants. Be sure to always check your infant for ticks and chiggers, especially if your little one is going through their pudgy phase.
When making hiking or camping plans with an infant the first rule is to be very flexible. Don't expect to hike ten miles into the woods on your first day. Be prepared to head home or change plans based on your child's needs. Plan to allow for wiggle breaks where your baby can get out of the child carrier and move around.
Most people who take babies and small children into the woods share space in their sleeping bags when night falls. Most pediatricians would advise against this practice due to the increased risk of SIDS (Sudden Infant Death Syndrome). If you are a heavy sleeper you should consider other alternatives. You will also need to keep your eyes open for your infant at all times. A tiny ant, spider or even a mosquito can be very vexing to a tiny person, and if allergic reactions are severe could be life threatening.
Wilderness areas or National Forests that allow dispersed camping are excellent places to go with your infant. If your child has decided it is time to stop for the day you have the flexibility of setting up camp versus having to do a death march to reach the specific site you're holding a permit for. Be prepared to accept the fact that you may have to simply turn around and go home.
A good child carrier can be used until your child is around five years old, or about 45 pounds. If you have exposed your child to the joys of hiking as an infant, the odds are you probably won't be carrying them around when they are five, as they will be eager to use their own two feet and explore with you.
Like most everything else in the outdoors a little research, education, and patience will go a long way to having a good time with your baby when you hit the trail. Be sure to check with your pediatrician for their opinion on when to expose your baby to the outdoors. Be patient, kind, and flexible and your little one will grow to love the outdoors and will be eager to join you on grander exploits, as they get older.