Okay, so this might be a stupid question but I have no idea what to do...

I'm currently boiling tap water and letting it go cold before giving it to my bub but I know others who give their bub water straight from the tap... Should I still be boiling his water first or is tap water okay around this age (7 months)??

And does anyone know the reason for not just giving straight tap water to babies?

Thanks in advance!