Here is a great tip I was shown many many years ago that your babies will love! Those horrid "Cones of Shame" are not comfy and they can restrict their movement. I have 4 Bichon and 3 of them all wore these after neutering. They are comfy and also nice and snuggly :) After their ops I popped one of these on with their favourite blanket and they nodded off in comfort to sleep off the meds.
These are shop brand *any will do baby onesies/sleepsuits just worn in reverse :) Just cut out a little material as the picture below shows so they can relieve themselves when needed. Make sure to close all 3 poppers on the onesie only one was shown in the pic but all 3 should be closed