Snacks and fluids: For kids 1 to 24 months old, bring breast milk or formula (or cows' milk if they're at least a year old). Bring water, too kids can get dehydrated even if they're only passengers. Keep milk and formula cool in a collapsible insulated tote bag or small cooler. Bring a variety of snacks. Don't forget to pack water for yourself.

Gear: Pack a blanket or sheet to sprawl on, a lightweight first-aid kit, and, if you have a curious toddler, a shovel and small coffee can or plastic bowl with a lid to gather treasures.

The right clothes: Dress your child in long cotton pants, a long-sleeved T-shirt, and a wide-brimmed hat. This outfit will keep him cool, comfortable, and protected from the sun. Sneakers and socks are better than sandals for toddlers so you won't have to stop every 10 feet to dislodge a rock. Bring a spare T-shirt and extra layers in case it gets chilly. And don't forget a diaper or two.

Sunscreen and bug repellent: Sunscreen is now considered safe in small amounts on the face and hands for babies under 6 months, but bug repellent isn't, so it's best to keep your baby covered with clothes and a hat. If your baby is over 6 months, sunscreen and bug repellent can be useful as long as you don't get them anywhere near your child's hands or eyes. But don't rely on them too heavily clothing is still the best insurance against bites and burns. When choosing products, avoid anything that contains both sunscreen and insect repellent, and any repellent containing more than 10 percent of the chemical DEET (check the label). Products containing DEET may be linked to certain health problems. Skintastic, made by Off, is the favorite of many pediatricians. The bath oil Skin-So-Soft (from Avon), is also recommended for older babies and toddlers but not for babies under 6 months.

(taken from freelance writer John Eastman's tips on hiking with babies and toddlers)