You should seek the advice of a NY personal injury lawyer because the school, or someone else, may or may not be liable for the injuries to your child depending on the particular facts of your case.
Just to add to Brian's answer, you should speak to a personal injury attorney right away regarding the facts and circumstances of the matter. I'm assuming that you are talking about a New York Public School. In New York, you only have 90 days from the date of the accident to file a document called a Notice of Claim. If you fail to file within the required time frame, you need to have a very good reason to extend the filing period.
Best of luck.
Maybe. It depends on how the child was hurt. School cases are difficult but with a lawyer that has handled these matters you might be able to substantiate some negligence on the part of the school. Since these matters are difficult you should consider asking the school if they have a medical policy for the students that are hurt on their property.
Sign up to receive a 3-part series of useful information and advice about personal injury law.