When can I get my little 'un on a bike?

I've got a little boy who's coming up for 6 months and I am starting this think about getting him out on the bike.
I realise that at the moment he's still a little on the young side but i'm just thinking ahead more than anything.
He has been able to hold his head up well for a while now. I'm not taking him out without a helmet so i realise he needs to be able to hold his head up well with a helmet first. I'm probably going to get one of those front child seats so he's between my arms and can see forwards where we're going.
I'd like to be able to take him out this side of winter if at all possible.
Are there any guidelines on this sort of thing? And when have you guys started to take your kids out on the bike?
I realise that at the moment he's still a little on the young side but i'm just thinking ahead more than anything.
He has been able to hold his head up well for a while now. I'm not taking him out without a helmet so i realise he needs to be able to hold his head up well with a helmet first. I'm probably going to get one of those front child seats so he's between my arms and can see forwards where we're going.
I'd like to be able to take him out this side of winter if at all possible.
Are there any guidelines on this sort of thing? And when have you guys started to take your kids out on the bike?
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When you're ready to start, I found that MET helmets go a little smaller than a lot - though I've heard that Raleigh do too...
HTH,
_
Everytime they went in it though they fell asleep!!
If it doesn't move and should, use the WD40.
If it shouldn't move and does, use the tape.
+1, although primarily for rear-mounted seats. For little ones, I found a trailer easier/better for a whole host of reasons. (Ultrashort-trips from about 9m, but really didn't start until 12m).
I'm a big rap for mid or front mounted seats, and the Yepp seems to be the pick of the bunch atm.