Washington, January 14 : Naomi Watts has returned to her former curves after delivering her second baby in less than a month - and the secret behind it is breast-feeding.

The `Mulholland Drive' actress, who welcomed her second son, Samuel, with partner Liev Schreiber on January 13, had been recently snapped looking her former slim self.

"I''m breast feeding. And he''s sucking it all out of me, it seems. And when the baby comes out, it''s a lot of weight right there," Contactmusic quoted her as telling People magazine.

Speaking of their 18-month-old Alexander and the new tot, Schreiber revealed the 24X7 shifts were taking its toll on the pair, though they happily remained without complaints.

He said: "It''s f**king hard. So little sleep. It''s 23 hours and 59 minutes of exhaustion.

"But then they do one little thing in that last minute that is just so compelling and fascinating that it makes the other 23 hours and 59 minutes worthwhile." (ANI)