Hii doctor, unfortunately I gave my kid a worm...

is there any risk in your child case ?
no , 3 days expiration doesnt suggest any high risk , but we advise you the following :
1. stop using the current expired medication
2. buy new one , and if you are taking the medication without doctor supervision , reconsult your child doctor 
general advices :
1. avoid junk food 
2. increase your child immunity by :
- healthy food 
- sleeping well 
- promote healthy moving and avoid laziness 
- give your child multi-vitamins after consulting his/her doctor