Brown tounge in 4.5 month old

[stickybean]

I'm not sure if this is the correct place to post so appologies if not...
I have noticed that my DD has developed a slight brownish colour on her tounge...almost as if she's just had a coffee.
I gave her some calgel for teething on Saturday night? could it be that? If not what might be causing it?
Am going to get her weighed tomorrow so will ask the HV but thought i'd check to see if anyone on here had any ideas.
She seems fine within herself.

Thanks in advance

[wrinklytum]

Could it be oral thrush?

[stickybean]

She has had that before and her mouth was white not brown, i really hope it isn't as i am still breast feeding and it was awful last time.

[stickybean]

Bump... the health visitor had no idea at all. Anyone else?