Illegitimate to Legitimate

Sino na po dito nakapag process ng legitimation ng kanilang LO? May I know how much is the process and kung totoo ba na mas mahabang time na illegitimate si LO is mas malaki ang babayaran? Any insights po about this? Planning to get married na kami ni partner my 1 child kami. Ipapa legitimate namin since nagbabalak kami mag canada. Thank you sa sasagot.