Most other mammals have a placenta through which the developing foetus obtains nourishment, but in marsupials, the foetal stage is very short and the immature young is born and finds its way to its mother's pouch where it latches on to a nipple and completes its development.
mˈoʊst ˈʌðɚ mˈæməlz hæv ɐ pləsˈɛntə θɹuː wˌɪtʃ ðə dɪvˈɛləpɪŋ fˈiːɾəs əbtˈeɪnz nˈɜːɹɪʃmənt, bˌʌt ɪn mɑːɹsˈuːpɪəlz, ðə fˈiːɾəl stˈeɪdʒ ɪz vˈɛɹi ʃˈɔːɹt ænd ðɪ ˌɪmətʃˈʊɹ jˈʌŋ ɪz bˈɔːɹn ænd fˈaɪndz ɪts wˈeɪ tʊ ɪts mˈʌðɚz pˈaʊtʃ wˌɛɹ ɪt lˈætʃᵻz ˌɔn tʊ ɐ nˈɪpəl ænd kəmplˈiːts ɪts dɪvˈɛləpmənt.