Hi Jen1805,
I don't have any experience or knowledge about children with ADHD and medication, but an adult that I know saw a GP yesterday and explained that Ritalin can be given in smaller doses to test the effect first, therefore you can adjust and play around with the best dose with minimum side-effects. Once an improvement is noticed the doctor might prescribe Concerta (which I understand is very similiar to Ritalin in composition and effect) will be prescribed at the correct dossage as a daily dossage since it is a slow release medication compared to the Ritalin that can be given in more than one dose per day (depending obviously on what your doctor prescribed).
But please don't take my word for it - rather speak to your doctor, this is only hearsay that I am posting here.