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The actress says a second child will make her "truly a mum"
Pregnant Alba, who already has three year old daughter Honor with husband Cash Warren said another kid will take her to another dimension of motherhood.
"It feels like you're really officially, really truly a mother when you have two kids" she said to People.com "One kid you're a mother for sure but two takes it to another level."
Alba has also said that she's getting the nursery ready, only using eco paint.
On her plans to get back into shape the actress admitted she's not keen on working out.
"Working out every day for even just 45 minutes is good for my mental state" said the 30-year-old "Getting dressed and actually doing it is the worst. It's hard to get motivated"