How many kids can a Muslim have?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.

There is no limit in Islamic legislation about the number of children that one is allowed to have, one is not forbidden to have a maximum number [and he should not limit himself to a specific number].

However, Islamic legislation encouraged us to increase the progeny and marry women who can bear children. The Prophet said: "Marry women who are loving and very prolific, for I shall outnumber the nations by you on the Day of Resurrection." [Abu Daawood]

So it is encouraged in religion to have as many children as one can because this is filling the Earth with the obedience of Allaah and His worship, holding the word of Allaah high, and increasing the progeny.

Multiplying the progeny is also a provision for the person in this worldly life and in the Hereafter especially if one nurtures his children according to Islamic principles and good moral conduct.

The Prophet said: "When a man dies, his deeds come to an end, except for three: a continuous charity, knowledge that benefits people and a pious child who supplicates for him." [Ahmad]

Allaah Knows best.