No. As strange and uncomfortable as it may seem, think of a baby kangaskhan as a living hold item. Because of how close (physically speaking) a baby kangaskhan is to its mother and because of the near genetic match, a poké ball is capable of storing both mother and child in the same poké ball at the same time.
And before anyone asks, no, this does not result in the fusion of the two, nor does transporting this poké ball. Fusion occurs due to entirely different circumstances, none of which I will happily talk about on a public blog, regardless of what certain individuals may have you believe.
The Pokédex According to Bill 