My iPhone 4s isn't charging as fast as it should be, what could the problem be?

I plugged it in about an hour and 40 minutes ago when it was as 10% usually an hour later it should be at about 50% or higher. I checked it right now and it was barely at 14%! I checked if the charger was correctly plugged into the outlet and i checked if the charger was plugged into the phone correctly too, and it was. I barely got the iPhone 4s one month ago I don't know why I'm already having problems with the battery.
if you guys know or have had the same problem before please let me know.

Restart the phone and reconnect the phone

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