Aww, poor baby, alam ko how frustrating yan! Honestly, a few of us moms na may sensitive skin kids tried going back to basics, like plain water lang for bath time, or mag-try ng fragrance-free talaga talaga (not just "gentle"), and one of my friends swears na pag nag-pat dry lang instead of rubbing, it made a difference sa irritation ng baby. Since you've tried multiple soaps na and it's still the same, I'd really suggest checking with your pedia ulit para ma-rule out kung may underlying skin condition like eczema or allergies, kasi sometimes it's not the soap itself kundi what the skin really needs. In the meantime, try moisturizing right after bath habang damp pa the skin, works better that way!