Determining the sex of a newborn Pomeranian puppy is as easy as observing the genital area of the puppy. However, newborn puppies are incredibly delicate in many ways. The puppies themselves should be handled very carefully, since, just as newborn children, they are fragile. If possible, wait until the puppy is three to four weeks old or properly weaned before handling it. Pomeranian puppies have a smooth, thin coat of hair when born, unlike their thick adult coats, which makes determining their sex easier.
Observe the puppies with their mother. If the mother is exhibiting signs of aggression when you approach the puppies, or she is overly protective, wait until the puppies are three or four weeks old, or properly weaned before handling them.
Wash your hands with soap and hot water, and dry them thoroughly. This will prevent the spread of germs to the young puppies and help keep your human scent off of them, reducing the chance of rejection by the mother.
Heat a clean towel in the drier or on a heater. The towel should be warm to the touch, but not hot.
Gently pick up one of the Pomeranian puppies, supporting its head and neck. Do not remove a puppy when nursing and do not pick up puppies by their tails. Place the puppy on the warm towel on its back, with its belly up.
Locate the umbilical cord in the centre of the puppy's belly. The umbilical cord is a dark coloured cord that is attached to the puppy's belly.
Locate the puppy's penis about one centimetre below the puppy's umbilical cord, if it is a male. The penis will be a small, oval-shaped bump with a central opening for the urethra.
Look for the puppy's vulva, if it is a female. The vulva will be near the dog's anus, between her legs. The vulva is a raised, leaf-shaped area with a vertical slit opening in the middle.
Return the puppy to the mother as soon as the sex has been determined. Newborn Pomeranians can get cold if kept away from their mothers too long.