Cruz and her Spanish Hollywood counterpart Javier Bardem had their second child six months ago; a girl they've named Luna, meaning moon in Spanish.
The Madrid-born actress is a firm believer in breastfeeding. "I breastfed my son (Leo) for 13 months and I plan to do the same with my daughter," she told fashion magazine Allure.
"It's hard when the day comes when you have to stop.
"Nursing is addictive," she added.
Only days after being named 'Celeb with the hottest body' by Fitness Magazine, the mother-of-two doesn't seem at all concerned about packing on the baby kilos.
"I'm supposed to get extra calories because (when) breastfeeding you burn, like, an extra 500 a day."
In her interview with Allure, part of the January edition, Cruz also explains how she always knew she wanted a family because of the way she was brought up.
"Family has always been the most important thing," she said.
Motherhood is also the central theme of Cruz’s new movie Twice Born, a story of an infertile woman's struggle to have a child, set against the brutality of the Bosnian war.