No offense, but first thing first, I have to yell at you. DO NOT LET ANY SNAKE GET SO CLOSE TO BABIES OR TODDLERS!!! If they must be in the same room, make sure they're on opposite sides with at least one person supervising each!!! And no snake should be allowed to run loose around the house. They need very secure enclosures.
For little snakes, it's for their safety. For larger snakes, it's for our safety. Snakes aren't bad creatures, on the contrary, they're very nice. But they are highly instinctive. Loose little snakes could hide under sofa cushions and get sat on, and loose big snakes (8 ft and up) could potentially pose a danger to people (or if they get out of the house, scare the jeepers out of the neighbors).
I'm glad you picked the poor little fellow out of the wild. You probably saved his little life. But is this your first snake? Just as a warning, Burmese Pythons make horrible beginners snakes. While they often have very gentle temperments and are beautiful animals, they can grow more than 20 ft long and gulp down multiple rabbits per month! And contrary to legend, a small enclosure won't stop their growth, just make them uncomfortable. And you'd need a dedicated helper to assist you every time you so much as change his water after he gets to 10 ft or so. For 25-40 years...
Your best bet if you want a good pet snake, may be to contact animal rescues, reptile rescues and wildlife centers to try to find him a good new home while he's still little. Then you could research cornsnakes, kingsnakes, or little kinds of pythons like spotted or ball pythons. All of which are far better to start with.
But meanwhile, care tips for until you can find him that good home. The best temporary option may be to get a sturdy rubbermaid container and modify it, drilling holes for ventilation etc... Just don't let him freeroam.
Pythons in general like warmth and humidity, so get him a good heating element to warm one side of the rubbermaid, and a large waterdish for the cooler side. Put a hide box on each end so he'll feel more secure. Use newspaper for flooring.
For food, get him a frozen rat from you local pet store (no bigger around than the widest part of his body) warm it thoroughly to the temperature of a live rat by using warm water and drop it in near him with tongs. There are many good references on the web. One site I like and use for basic questions is, www.anapsid.org which covers the basics far better than very sparse advice I just gave. Or just scroll down these forums.
So, keep him away from your nephew, good luck, and hope you find him a good home.
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0.1 chickens (Condor)
0.2 dog mutts (half ownership, only mine when they misbehave, Lucy & Amy)
0.1 Halflinger horse (Crissy)
0.0 Arizona Mountain Kingsnake (coming soon)
1.1 parents
Still searching for 1.0 WC human