“In considering whether to order retroactive child support, “unreasonable delay by the recipient parent in seeking an increase in support will militate against a retroactive award, while blameworthy conduct by the payor parent will have the opposite effect.” D.B.S. v. S.R.G 2006 SCC 37 (CanLII), [2006] 2 SCR 231 at para. 5. The court is also to consider the needs and circumstances of the child and the hardship to the payor of a retroactive award. Retroactive child support must not amount to a wealth transfer: Walsh v. Walsh (2004), 2004 CanLII 36110 (ON CA), 69 OR (3d) 577 (CA) at para. 16. Child support is, of course, the right of a child and is an obligation that exists regardless of the commencement of any proceedings to enforce it. (Michel v. Graydon, para. 41)”