Just checking to see if the advice about solids and having to introduce them 10-15 times before a baby might take to something is really true? 10-15 seems like an awful lots of times, and tends to result in expired Gerber dishes, which isn't a huge loss, of course, but my son eats so little. Just wondering. Also, is the one food per every three days a hard and fast rule to check for allergies?

Thanks!