Tomato pasta works best when you think of it as two small jobs running alongside each other: pasta on one side, sauce on the other. That is a lot for a child to hold in their head, so the visual card is useful. It lets them see that boiling and draining the pasta is one track, while chopping, cooking and simmering the sauce is another.
Before you start, decide how much chopping your child is ready for. If chopping onion and garlic will make the whole recipe tense, pre-chop them. That does not make the recipe less child-led. It simply moves the challenge to the places where your child can succeed: adding ingredients, stirring slowly, watching the sauce change and grating the cheese.
The simmering step is a good place to practise patience. Children often want to rush as soon as the tomatoes are in the pan, but the sauce gets better when it has time to bubble gently and thicken. Point out what is changing: the watery edges disappear, the tomato lumps soften, and the spoon starts leaving a clearer trail through the sauce.
Draining is the step to slow right down. A child who has stirred calmly may still not be ready for a heavy pan of boiling water. Offer adult help clearly and give them a nearby role, such as checking the colander is in the sink, holding the pasta bowl away from the steam, or watching for when the pasta has stopped dripping.
Save a little pasta water if you can. It gives you an easy rescue if the sauce gets too thick or the pasta starts clumping. Then hand the recipe back: pasta into sauce, stir until coated, cheese on top. That final separate cheese step matters because it gives children a safe, satisfying finish after the hotter work.