Newborn piglets weigh around 600-1,000 grams, and do not leave the lair for their first week of life. By two weeks old, the piglets begin accompanying their mother on her journeys. They take their mother’s milk for about three months, and begin copying their mother’s feeding behaviours at the age of two to three weeks. The permanent dentition is fully formed by one to two years. Sows are sexually mature at one year old, and males at two years.
However, oestrus usually first occurs after two years in sows, while males begin participating in the rut after four to five years, as they are not permitted to mate by the older males.