Local Mandopop superstar Stefanie Sun, 34, cuts a svelte figure in her first public appearance after giving birth to a baby boy last October.She was named the new ambassador for Abbott Nutrition.Dressed in a fitted black top and a long white skirt, she said at a press conference on Tuesday at Goodwood Park Hotel that she has lost "most of the baby weight" already."I'm still 4kg above my usual weight but weight gain is really the last thing on my mind. I'm running around all the time with the baby, so I think I will be able to lose it."She also said that she currently does not intend to have a second child."I feel quite tired, so at this moment, no, I have no plans for a second. But maybe when I get the hang of it (parenting) more, I will."She is married to Dutch-Indonesian Nadim Van Der Ros and has still not revealed her son's name.