Hi and welcome to YT. I am not familiar with partis but my Hot Rod and Maggie May were both very small when they came home to us. Just keep an eye out for them as for hypoglycemia. It's recommended to have Nutrical on hand if they should have any episodes. You may never have an issue but it is good to have just in case. It is when they do not eat for a while, their blood sugar can drop and little ones need extra care.
Just be careful with what your little one is exposed to before his shots. Your vet may recommend not letting him wondering on the grass, especially in areas that other dogs may be.
Best of luck and congrats on your little one.
What is his name?