All artwork submitted should be print ready and sized excatly at the size you would like it to be printed at. You will also want to make sure the actual artwork and not the artwork template is sized correctly. The following imprint sizes are the max imprint areas we recommend per product type:
Toddler/ Infant: 7"x8".
If you need more information, have additional questions or just can't find the answer to your question here, please submit a support ticket and one of our account managers will be happy to help.