Oo normal lang yan, lalo na pag newborn pa lang, marami kaming babies na ganyan ang dating ng belly button, parang medyo recessed or malalim talaga! One of my mum friends's baby had the same thing and her pedia said it's nothing to worry about, basta walang redness, discharge, or bad smell around it. Just keep it clean and dry lang, at matataas din yan naturally as baby grows, kaya relax ka na dyan mama!