Apparently no one explained to him where babies come from. Okay OP -- first a man and a woman (okay those are generic terms because sometimes they act more like immature than that but it does take a male and a female to have a human baby) get together. They expose their genital areas to one another and the male genitals slip inside the woman genitals. Clothes may not be FULLY removed at this point if ever. And sometimes it is not intentional -- the guy may trip and accidentally enter the woman or the woman may fall onto the guy due to lack of energy to fight gravity. Sometimes they both really really want it. Sometimes the man has place a donation with a sperm bank or fertility doctor but I am dealing with the most COMMON way. So keep following.
Then the man when he gets excited can't control his explosion and liquid containing sperm is forced into the woman's vagina. (Repeat after me, boys have a penis, girls have a vagina. Men are grown up boys and womem are grown up girls. I dont want to lose you OP. You still hanging in there.) Then in some cases, a sperm (looks like a little tadpole) swims really really far compared to its little size and struggles to reach an egg which is inside the woman. Now you can't see this but it happens sometimes. The sperm burrows INTO the egg and this causes the egg to fertilize. Now when the egg is fertilized, if everything goes okay the egg attaches to the wall of the woman's uterus. Now I know this is hard to imagine. Because you don't see any of this happening because it is inside but bear with me OP.
Now as the egg implants on the uterine wall, it begs to have its cells divide rapidly. Over the course of time, the egg transforms to a zygote, an embryo, a fetus and then finally a baby emerges from the woman.
But yes OP it does take a male and a female. A woman can't do it herself. She still needs the sperm. Now does that help you?
I mean my five year old understands this much so if you don't I can try to break it down for you. I really can. I can also suggest some books written for elementary students. Okay? Just trying to do my part.
I do feel sorry for you that your mom or dad or even the school couldn't make sure you understood this much. Do you understand how your body works now? I dont want to confuse you. Can someone else chime in? Please? This is sure complicated.