I had a lot to say on this reading.
Exodus 13: This chapter starts with God telling Moses that all firstborn of the humans and animals should be consecrated to him, declaring them his. It then jumps to reiteration of the seven day celebration his people are supposed to have every year (passover) with unleavened bread. The people are told to tell their children about what happened, making this an educational experience. On a side note, as an educator, this is definitely an effective way to do that. Back to the text. The story they returns to discussion of the consecration of the firstborn, this time specifically saying males. I have to admit that when I first read this I thought God was telling them that they all had to sacrifice their firstborn males. Glad I was wrong once I read a little further.