I overheard Pinkie talking about her experiences foal-sitting in the market place, so I decided it might be a good idea if I explained a few things that might seem odd.

It’s not strange for a baby pegasus to fly or a baby unicorn to use magic. At that size a pegasus doesn’t have to generate as much lift to get off the ground. As the pegasus grows it will gain weight and in most cases lose that ability for a while until its wings catch up. Likewise, a baby unicorn can inadvertently cast all manner of spells. Yes, there’s even been reported cases of self levitation and phase walking, which are ordinarily very advanced and very difficult spells to maintain. But they’ll also grow into a stage where they lose that ability. I can’t explain exactly how that works, because how a unicorn uses magic isn’t deemed fit as common knowledge for everypony to know.

In short, there’s nothing strange about a foal flying or tossing around objects with magic. It’s uncommon, but not strange.