Gap on Full size bed for toddler?

I just bought a full size bed for my 30 month old daughter. It's pretty high above the ground but is against the wall and has a large side rail we installed. My concern is the 4 inch gap between the footboard and the bed. Is that normal ? I could just put some blankets there in the gap but I wanted to know if... show more I just bought a full size bed for my 30 month old daughter. It's pretty high above the ground but is against the wall and has a large side rail we installed. My concern is the 4 inch gap between the footboard and the bed. Is that normal ? I could just put some blankets there in the gap but I wanted to know if this is typical and isn't a reason for returning the mattress. When I bought the frame, I didn't notice a gap in the model and it could be because of the mattress.

Any help would be appreciated. Thanks.
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