Knitting

The second week of her eighth month, Brennan was put on bed rest. When Annie Booth heard that her son couldn't keep his girlfriend occupied, she suggested a hobby.

"How about knitting?"

Her son did not snort because his parents had never met Bones. Actually the hormones were making it the same for him.

Surprisingly, when supplies arrived, Brennan knitted obsessively. By the ninth month, Hodgins was getting annoyed because she was now making woolen microscope caps.

She went into labor while Booth was at work. When he arrived, he was unsurprised to see a needle buried in a wall.