According to The Parent Review, this is BB now:

"Blood vessels develop in its lungs and its plugged nostrils begin to open."

I hope it doesn't get lousy sinuses like its Dad and I.

"Its hearing will be developed enough to respond to outside sounds and voices, and it may jump at sudden noises."

Ok time to watch the language. :p And speak in complete sentences. And play nice soothing music.

With sleeping, here is what they say:

"While there's no risk caused by sleeping on your right, lying on your left side will improve the flow of blood and nutrients to the placenta and help your kidneys eliminate more efficiently. When your kidneys are working efficiently, you are less likely to have swelling in your ankles, feet, and hands."

Moral of the story, sleep on the left.

On manicures (which I don't bother doing) and hair dyes...

"It's wise to be cautious about exposing yourself to any chemical (even furniture polish) while you are pregnant, but you can still colour your hair or polish your nails without concern. When using any chemical, including nail polish, just be sure to do so in a well-ventilated room."

(Credit: The Parent Review)