Sherlock left the crime scene as the last of the police cars pulled away, a very small baby wrapped safely in the right flap of his long coat. He pulled his phone out of his pocket and was about to send a text to John when he realized that texting while trying to hold a baby may not work very well. Instead, he pulled off his glove and dialed John's number. He picked up after one ring. Sherlock sighed as he looked at the child.
"I've found a baby at a crime scene and I need help," he told John, seeing no need to add anything extra to his statement. "I went without you. A young couple was murdered. I don't think the killer saw any need to murder the child as it couldn't act as a witness and would probably die on its own anyway." He heard John sigh and take a moment to think before replying.
"Bring it back to Baker Street, I guess. We'll feed it and bathe it and I can look it over. How old is it?"
"I'm not sure exactly. Very small, not speaking. Maybe a few months old. I'll look up the mother's records in the morning. The heat was off in the house though, and the scene was quite a bit outside the city. We think it's been about 20 hours since the murder, so it hasn't been fed since then. It's got a bit of a fever." Sherlock jumped in a cab that had stopped for him and lay the baby on its legs, one hand behind its small head. The baby stared at him, bright blue eyes sparkling with tears as it realized he was not its father. Slowly it began to cry. He tried to shush it, but after a couple failed attempts, he gave up, deciding John would take care of it in a few minutes' time.
"Is 'it' a boy or a girl?"
"Girl. I'll take care of her until I get home, then you can take over from there, how about that?"
"Fine," John said, calming down. "Try not to be yourself please, I don't want her upset before you even get home. I don't want Mrs. Hudson to panic, I've just gotten her over her flu."
"She's making horrible sounds, John, and I don't know why. She's not injured, I've checked."
"How do you know she's not ill?"
"Her skin is a normal color and she's not dehydrated. The fever is too mild to upset her." There was a pause as Sherlock continued to check for other sources of agitation. "...Oh."
"Yes?
"John?"
"What?"
"Do you know how to change a nappy?"