When my Yorkie was about that age, I put her in a larger cage that held her bed and then put a pee pad down in front of it. It worked out very well. I always left food and water with her because I did not want her to have a hypoglycemic attack. She eventually started shredding her pee pads so I got some baby lap pads to put in the crate and that worked well, also.
Good luck with your baby.
__________________  Bandit-9 yr Boxer, Sawyer-5 yr Boxer, Maggie 2 yr old Doxie  Isabella-3 1/2, Colby 1 1/2 yr Yorkies |