Hi...digital devices, phones and cameras, even advanced ones, still don't make the grade as far as still shot quality. You already have a darling little moving object but unfortunately that is what will be captured: the movement, thus creating a blurry image. On old-school standard cameras and even some of the newer devices, you may be able to set it to a "burst" mode or similar instruction, that is to take several photos in quick succession. Though I find digital photography still has that weird, very fraction of a second lag time, you may capture something close to focused and afterward you can delete the bad ones. It's the best I got for you.
My son is 1.5 yrs old. Anytime I take a picture it is blurry as he is usually not sitting still. Please help with any setting or any tips