Breast Feeding Passengers!!!

[falps]

Gentlemen, you are probably more bothered by the whole thing than a breastfeeding Mum is!
Like Xen says, it's a natural act.
It also tends to be a pretty absorbing and pleasurable pastime for both Mum & Sprog.
She probably will not notice you peeking, nor will you actions be of any great interest to her.
Being a new Mum tends to focus the mind, and learing gents are NOT important in your universe during that turbulent time of your life!

Peek away and don't feel guilty I'd say.