Birth occurs onto the sea ice, which often results in a change of external temperature in newborn pups. Weddell seal pups weigh about 29 kg at birth. They have a gray lanugo, which after 3 to 4 weeks turns to a dark coat. Weaning takes place at 6 weeks of age and maturity at 3 years. Behavior The majority of the behavior occurs under water during the night.
Reproductive behavior occurs underwater also.
The female is mounted by the male from behind while her sides are held by his foreflippers. Quite often she is bitten on her neck while copulation occurs. Weddell seals move in slow humping motion on land as well as on ice. They swim at a speed of about 5 to 7 knots, using their fore and hind flippers. Drinking sea water as well as eating snow helps this seal meet its water consumption requirements.