Usually on the third or fourth day, the baby should begin to have 6-8 wet cloth diapers (5-6 wet disposable diapers) per day. (An easy way to feel the weight of a wet disposable diaper is to pour 2-4 tablespoons of water in a dry diaper.)In addition, most young babies will have at least two to five bowel movements every 24 hours for the first several months, although some babies will switch to less frequent but large bowel movements at about 6 weeks.

A baby that is sleeping rather than feeding every 2-3 hours or is generally lethargic may need to be assessed by a health care provider to make sure that he is adequately hydrated.

These are additional important signs that indicate your baby is receiving enough milk:

The baby nurses frequently averaging at least 8-12 feedings per 24-hour period.
The baby is allowed to determine the length of the feeding, which may be 10 to 20 minutes per breast or longer.
Baby's swallowing sounds are audible as he is breastfeeding.
The baby should gain at least 4-7 ounces per week after the fourth day of life.
The baby will be alert and active, appear healthy, have good color, firm skin, and will be growing in length and head circumference.

From:http://www.llli.org/FAQ/enough.html.