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In page Western brush wallaby:

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Although decades of research have been done in regards to the reproductive behavior of the western brush wallaby, their habits are relatively unknown. The young are usually born during April and May. Females, like all marsupials, have a well-developed forwardly opening pouch containing four teats.[1] The female gives birth to one young a time, with two rarely occurring. Gestation lasts from three to five weeks. After birth, the young enter the lactation period for seven months, until October or November.[2] After vacating the pouch the young wallaby goes through a weaning period during which it will stick its head in the pouch temporarily attach itself to a teat.