Guessing Game

A friend suggested we have a 'Kitten Pool' so M's followers could submit guesses about details of her impending litter of kittens.  Another M fan then submitted an illustrated guess.

So, here it is!  Leave a comment with your answers for the following:
     1. What day will they be born?
     2. How many kittens in her litter?
     3. What color will they each be?

Here are some hints:
     1. M's caregiver first noticed that she was pregnant on March 15th.
     2. She has gotten significantly bigger in the last three days, her belly is                       noticeably lumpy, and when she lays down it's usually on her side.
     3. M is 8-10 years old.
     4. She had 4 kittens in her last litter.
     5. All 4 kittens from her last litter were tabby and white.
     6. The father cat is unknown, so no help there!

There won't be any prizes for having the most accurate guess, but it's still fun!  All the guesses will be posted later in the week, assuming M doesn't deliver before then.  So far there's one guess, for a litter of 5 purple kittens.