Actor Dax Shepard was left traumatised after seeing his wife Kristen Bell undergo a Caesarean section.

The couple welcomed a second daughter, Delta, last month (Dec14), and during a visit to Ellen DeGeneres' U.S. talk show on Thursday (15Jan15), Shepard opened up about the actress' difficult, 33-hour labour, which was more intense than their first experience with 22-month-old daughter Lincoln.

Shepard explains, "It was not easier, it was more difficult. Kristen, God bless her, was in labour for 33 hours. For Lincoln, it was only 15 (hours) - that's child's play. This was intense."

After more than a day of labour, Bell had to undergo a Caesarean section, which Shepard was not prepared for.

He recalls, "There's a sheet and then they go, 'The baby's here!' and you peek around the sheet but then you notice your wife is completely disassembled. I can see inside of her. I was like, 'It's a girl and thats your liver out! I think and those are definitely intestines - are you alright? Oh my God put her back together correctly!

"After seeing this autopsy, I would rather see a school bus drive out of her vagina. There's nothing worse then seeing your partner fully open. I need medication if this happens again."