Pot plants aren't babies. I have an actual baby, and I have marijuana plants and trust me they don't have very much in common.
How old is the plant? What kind of soil is it in? Got a picture?
It might be able to use some of the RapidStart, for a seedling a couple weeks or older in a medium without a lot of nutrition. I've never used it myself so I couldn't recommend an application rate. Try reading the bottle and definitely don't exceed the amount it recommends. Usage rates are typically provided in ml per liter or gallon. A typical water bottle is half a liter. Whatever it is it probably wont be much so you'll need a dropper to measure out amounts of 1-2 ml, again check the label though.
However, in a quality soil seedlings are usually fine with just water for up to 3 weeks or so.