How do you say he had 3 children in French?

There are a couple of ways to say "He had 3 children" in French, depending on the context:

Formal:

* Il a eu trois enfants. (This is the most common and neutral way to say it)

Informal:

* Il avait trois enfants. (This implies that he had three children in the past, but may not have them anymore. Use this if you want to emphasize the past)

To emphasize the number:

* Il a eu trois enfants, pas plus, pas moins. (He had three children, no more, no less.)

To add more details:

* Il a eu trois enfants, deux filles et un garçon. (He had three children, two daughters and a son.)

You can also use different verb tenses to specify when the children were born:

* Il a eu trois enfants. (He had three children) - This implies they were born in the past.

* Il a trois enfants. (He has three children) - This implies the children are alive and well.

* Il a eu trois enfants, mais il en a perdu un. (He had three children, but he lost one.) - This implies that he lost one child.

Remember to adjust the gender of the noun "enfants" ("children") depending on the context (e.g., "Il a eu trois filles" - He had three daughters).