Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Uneven fit

I bought these sheets in lilac and pink. The colors are very pretty and they look good in the crib. The problem is they don't fit over all 4 corners of the mattress. I never knew changing a sheet could be so difficult. I have broken fingernails and scrapped knuckles just from putting on these sheets. At first I thought all sheets were supposed to be this tight until I tried a bedding set sheet which goes on easily and covers all 4 corners and sides. The Koala Babys aren't big enough to tuck under. You can see the bottom of the mattress on one side and I worry that the sheet might slide up. I won't even bother using them anymore.