This one made me laugh out loud and I don't think any of the other replies understood it correctly. The astrologer has gone way out on a limb by telling the man

This one made me laugh out loud and I don't think any of the other replies understood it correctly. The astrologer has gone way out on a limb by telling the man that he is infertile without first ascertaining whether he has children. Then, when cornered, he desperately tries to cover his error by implying that the man is now infertile. "Look after them (because you won't be able to replace them.)"