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Better replace the pedal and most probably the crank arm as well. Sometimes a new pedal can cut the threads true again on the crank arm but the crank arm may need replacement too, depending on the damage. Remember to fit the correct side pedal. The pedal threads differ between left and right and pedals are usually marked "L" or "R".
THE BRAKE LIGHT SWITCH IS FAULTY OR OUT OF ADJUSTMENT LOOSE FELL OUT THE BRACKET.CHECK UNDER THE DASH WHERE BRAKE PEDAL ARM IS YOU SHOULD SEE A PLUNGER STEM LIKE SWITCH TOUCHING BRAKE PEDAL ARM.IF NOT SWITCH FELL OFF SUPPORT BRACKET.IF BRAKE SWITCH STILL IN PLACE MORE LIKELY BRAKE LIGHT SWITCH IS FAULTY.
If the thread on the crank arms that hold the pedals are stripped, you will need a new set of cranks. That is definitely a job for the bike shop. Make sure the pedals are snug in the arm, Right side pedal has right-hand thread, left side (looking down when you are on the bike) has a left-hand (reverse!) thread.
Your pedal falling off is never a good thing, nor is the entire crank arm assembly.
For this one you are best taking it into your local bike shop and have them take a look at why both of these fell off. There are a number of reasons, from stripped thread to missing bolts and nuts to improper assembly. None of these are a good scenario with a childs bike, or any bike for that matter.
Alternative, and my personal suggestion - Take the bike back to where it was purchased and exchange for a new one. These parts should not fall off after years of riding let alone 2 days, and would constitute a warranty and safety issue.
I WOULD NOT RECOMMEND CONTINUING TO RIDE THIS BIKE, SINCE YOU DO NOT KNOW WHAT ELSE WAS IMPROPERLY ASSEMBLED.
If, the threads aren't stripped, you can put it back on by getting a pedal wrench, and standing in front of the bike, now take the wrench and turn it towards you (clockwise) to tighten. But, if you rode with it loose, then you need a new crank arm. If, the store put it together go back to them but if you did, it is not a defect and you have to pay for one.
The reason the pedal fell of is because of a bad set up. Who assembled the bike? If, you did, guess what! You did not tighten the pedal to the crank arm to begin with. If, Walmart or other discount store did it, have them fix it. You have to understand. you bought the bike without professionals putting it together and sometimes that is a problem when you don't have the knowledge of what you are doing. You have to pay one way or another. When you let a kid ride a bike that is not assembled correctly you are endangering them. My advice is :Get it fixed right.