ly ▁during ▁the ▁soap ▁oper as ▁ 1 0 th ▁anni versary . ▁After ▁the ▁initial ▁birth ▁scenes , Call um ▁Campbell - R oss ▁was ▁cast ▁in ▁the ▁role ▁due ▁his ▁small ▁size ▁res emb ling ▁that ▁of ▁a ▁prem ature ▁baby ▁and ▁due ▁to ▁his ▁family ▁living ▁close ▁to ▁the ▁studio ▁where ▁the ▁soap ▁was ▁fil med . ▁Campbell - R oss ▁depart ed ▁the ▁role ▁in ▁ 2 0 0 6 ▁and ▁after ▁Henry ▁Williams ▁aud ition ed ▁for ▁the ▁character ▁of ▁a ▁child ▁patient , ▁he ▁was ▁rec ast ▁as ▁Harry ▁instead . ▁In ▁ 2 0 0 9 ▁produ cers ▁made ▁the ▁decision ▁to ▁rec ast ▁the ▁role ▁so ▁as ▁to ▁make ▁way ▁for ▁new ▁story ▁directions ▁and ▁character isation . ▁The ▁pitch ▁was ▁brought ▁up ▁during ▁a ▁meeting ▁with ▁direct ors ▁and ▁was ▁originally ▁met ▁with ▁hes itation . ▁Re id ▁Walker ▁had ▁previously ▁aud ition ed ▁for ▁several ▁different ▁roles ▁over ▁several ▁years ▁and ▁had ▁never ▁been ▁called ▁back . ▁In ▁ 2 0 0 9 ▁he ▁was ▁contact ed ▁to ▁aud ition ▁for ▁the ▁rec ast ▁of ▁Harry . ▁Prior ▁to ▁this , ▁Walker ▁had ▁considered ▁giving ▁up ▁on ▁his ▁acting ▁dream ▁but ▁within ▁one ▁aud ition , ▁he ▁won ▁the ▁role . ▁He ▁deb uted ▁in ▁September ▁ 2 0 0 9 ▁at ▁the ▁age ▁of ▁ 9 . ▁During ▁his ▁first ▁few ▁years ▁Walker ▁was ▁a ▁minor ▁member ▁of ▁cast , ▁film ing ▁ 2 ▁scenes ▁a ▁week , ▁but ▁by ▁ 2