I bought this Sealy baby mattress (link below) at
Walmart.com. It was $79 and they shipped it to my house for free.
Amazon has the same one, but it is more expensive. This one was recommended in the book "Baby Bargains", and has very good reviews. (Awesome book by the way.)
Some things you want to look for in a baby mattress:
*Very, very firm...pretty much rock hard. This helps prevents SIDS.
*Lots of steel coils. This one has 204.
*All around border rods. Keeps edges and corners firm, especially when the baby starts standing by the rails and jumping on the mattress.
*Steel vertical support rods to keep it from sagging in the middle.
*Very tight fit inside the crib with no gaps. Again, this is to help prevent SIDS. If a mattress doesn't fit tightly, you should return it to the store. (Another reason I ordered from Walmart.com, since I could have taken it back to the local store if necessary.)
Here's the one I bought:
http://www.walmart.com/ip/Sealy-Baby-Ultra-Rest-Crib-and-Toddler-Bed-Mattress/12662573
Just another thing I'll mention...don't use those adorably cute bumpers in the crib. They are a major SIDS risk, and doctors now recommend to not use them at all. (Same goes with pillows, blankets, comforters, stuffed animals, etc in the crib.) If a baby is getting their limbs caught in the crib railings, they do make breathable mesh bumpers.
Congrats on the new grandbaby!
