My baby ate a good amount of sugar

My husband put our donuts in the backseat in my purse and my almost one year old son was able to snatch it and we though he was playing with his toys so we ignored the noise.. turns out he grabbed all the sugar donuts out and licked the container it was in. There was a lot of sugar in there, in not sure how much he ingested. I’m really worried. Should I test his sugar with my device? Please help. I know he can get low blood sugar.