Oo normal yan, mama! Ang tahi usually mas nakakasakit sa second baby kasi the scar tissue from your first CS is still there, so parang nag-restretch lang ulit yung area, a few of us moms experienced the same thing. Pero if it's becoming unbearable or kung may unusual discharge or fever, better check with your OB agad para sure lang, ah, baka may complication na hindi expected. Rest as much as you can and don't hesitate to ask your doctor for pain management options, okay?