Lyric discussion by Arnold Layne 

Cover art for One Slip lyrics by Pink Floyd

I can't agree andeweathers. I think the lines...

"a momentary lapse of reason that binds a life for life"

Refers to the binding of two people's lives when they have a child together.

"the moment slipped by and soon the seeds were sown the year grew late and neither one wanted to remain alone"

Seeds were sown - the most blatent reference yet to pregnancy. Year grew late also makes you imagine the aging process and the development of pregnancy.

I'm pretty sure i've seen quotes from Phil Manzanera saying that Dave wrote this song about pregnancy.