Can we already bring our 6mos old lo to beach?

Oh! Yes, why not! Though, both different scenarios, but we took out 2 months baby to a place with -2 degrees temperature and it went all fine. All one has to see is the place we are going to, we are ready with all essential things. In your case, carry an umbrella so that you can put it over her pram or stroller so that she is saved from direct sunlight. Carry her food and clothes, (beach wear), diaper, etc. Have fun! :)