McGonagall takes Harry to her quarters and sets up the spare bedroom for him.
First, she conjures up a cot, with blankets and pillows and lays Harry down on it. Then, her hands free, she uses her wand to paint the walls emerald green, puts a badger on one wall, a lion on the other and an eagle and a snake on the ones left. She then puts the Hogwarts crest on the wall.
"Perfect. Now for some toys."
she then transfigures some matchsticks into cupboards and shelves. She puts books on the shelves and also transfigures a desk for when Harry grows up enough to be able to learn and write.
She steps back and surveys the whole room.
"What am I missing?
She then conjures up some toys for the boy and then calls Hagrid.
"Hagrid. Did you find any stuff from the nursery? Or was it all burned up?"
"Aye. Yes I did. Wait. I'll get it from me hut."
5 minutes later.
"There ya go. Tha's all I got from his house. Rest was all burnt up."
"Thank you Hagrid."
Minerva looks through the baby bag hagrid had brought with him. It had his milk bottles, some muggle baby formula, a packet of diapers and some stuffed toys, a wolf, a dog and a stag.
Well. Minerva thought. At least i'm set for tomorrow.
She then took Harry to the fireplace and sang him a lullaby to make him sleep. It was an old lullaby passed on generation after generation through the McGonagalls. Her mother used to sing it to her.
"My child. I will not leave you. I promise. No matter what happens. I'll always be here for you. I love you little kid."
so saying, she tucked Harry in his crib and left his room after setting up some charms to alert her in case anything went wrong.
In the morning Minerva was woken up by a sharp cry. She rushed to the boy only to find that he had wet his clothes.
"Oh dear. Let's get you changed, shall we?"
10 minutes later, a bathed and changed Harry is seen happily drinking milk from a bottle in Minerva's hand.
"Who's a good little boy, who's a good little boy? Harry is. ARen't you a good little boy. Yes you are."
Minerva was cooing to him. as soon as she was done feeding him, she set him up in a playpen with toys,and went to take a bath and freshen up. Fifteen minutes later, a fresh faced Minerva picked him up and took him out with her with the stuffed stag in her hand and Harry cooing to it.
She reaches the great hall and everybody stops whatever they're doing to stare at her.
"Minerva, where did you get that adorable child?" Pomona was the first to ask.
"Yes, do tell Minerva. Who is this brat?" Snape was the next one to drawl.
"Well, Severus. I'd prefer it if you didn't call my Harry a brat if you know what's good for you." She said, twirling her wand in her hand threateningly.
Sprout gasped. "Is that...?"
"Yes Pomona. It is Harry Potter."
"Oh sweet merlin. The great son of James Potter is here and he's going to be a pain in my ass i can foresee. Well Minerva, DO keep him far away from me."
"Of course Severus. AS you say."
And he got up and stalked out of the great hall and not a moment too soon as every body got up to play with Harry.