ðɪs ɪz, ɪn fˈækt, ðə mˈoːɹ kˈɑːmən pˈætɚn wɛn ðə tʃˈɪldɹən ɑːɹ ʌvðɪ ˈɑːpəzˌɪt sˈɛks, ɔːɹ wɛn ðeɪ ɑːɹ bˈɔɪz jˈuːʒuːəli twˈɪn bˈɔɪz.
This is, in fact, the more common pattern when the children are of the opposite sex, or when they are boys (usually twin boys).