Speaking without too much experience under my belt, but those don't look like juvenile leaves of a baobab to me. The growing tips also don't look like any of my A. Digitata. Other Baobab species might be different though (although the chance of them being not A. Digitata out side of of Oceania and Africa are quite low.)
What did you do to prep/scarify them? Mine sprouted with an 80% success rate within 3 days of planting with only 3 surviving over a year later (either due to dampening off or me choosing to kill them off. I don't remember exactly).