Where Do Baby Planets Come From?

We all know where babies come from, but what about baby planets? How do they form?

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Revolutionary ALMA Image Reveals Planetary Genesis (ESO)
"Young stars like HL Tauri are born in clouds of gas and fine dust, in regions which have collapsed under the effects of gravitation, forming dense hot cores that eventually ignite to become young stars."

VLA Shows Earliest Stages of Planet Formation (National Radio Astronomy Observatory)
"New images of a young star made with the Karl G. Jansky Very Large Array (VLA) reveal what scientists think may be the very earliest stages in the formation of planets."