The way the chemistry table seems to work (someone correct me if I'm wrong) is that every Logic level has a potion assigned to it. If the father did most of his Logic learning at the chemistry table, then he wouldn't be able to learn a new potion until he reaches the next Logic level. The child, however, if you made her use the blocks as a toddler, than I'm assuming her Logic skill started at level 3 when she started using the chemistry set? If so, then she would be able to learn any of the three potions associated with the three levels that she has accumulated. This means that she could very quickly learn the first three potions in seemingly no time since she doesn't have to sit there for a long time to level up.
Not sure if that makes much sense, but I'll try to clarify if you don't understand something.