Little Geno's First Adventure

Two babies were sat in their strollers, when one baby, Little Geno, shouted to the other, Sweet, "Are you a little girl or a little boy?"
"I don't know," replied Sweet giggling.
"What do you mean, you don't know?" said Little Geno.
"I mean I don't know how to tell the difference," was the reply.
"Well, I do," said Little Geno chuckling. "I'll climb into your stroller and find out."
He carefully maneuvered himself into Sweet's stroller, then quickly disappeared beneath the blankets.
After a couple of minutes, he resurfaced with a big grin on his face.
"You're a little girl, and I'm a little boy," he said proudly.
"You're ever so clever," said Sweet "but how can you tell?"
"It's quite easy really," replied baby Little Geno, "you've got pink booties and I've got blue ones!"