Apparently, Tinky Winky and Dipsy are male, Laa-Laa and Po are female.
Characters
Tinky Winky is purple and the biggest Teletubby. His favorite thing is his special red bag. Tinky Winky loves walking, marching, dancing and falling over. He has a special song which he loves to sing to himself, 'Pinkle winkle, Tinky Winky, pinkle winkle, Tinky Winky.' Tinky Winky loves big hugs best of all.
Dipsy is green and the second biggest Teletubby. His favorite thing is his black and white hat. Dipsy loves to dance, make cool moves and fancy steps. He has a special song which he likes to sing to himself, 'Bup-a-tum, bup-a-tum, bup-a-tum.' Dipsy loves big hugs best of all.
Laa-Laa is yellow and the second smallest Teletubby. Her favorite thing is her orange ball. Laa-Laa loves to dance, skip and sing songs. She has a special song which she likes to sing to herself, 'Laa-laa-li-laa-laa-li-laa-li-laa.' Laa-Laa loves big hugs best of all.
Po is red and the smallest Teletubby. Her favorite thing is her pink and blue scooter which she rides very fast. Po loves to dance and sing and do as she chooses. She has a special song which she likes to sing to herself, 'Fi-dit, fi-dit, fi-dit, fi-dit.' Po loves big hugs best of all.
https://en.wikipedia.org/wiki/Teletubbies#Characters
