Surprised none of the kids can have those as they contain dairy haha.
Was back on phone today and yep you are right Rosetti at 6 1/2months (he's about 8kg) he can have 50mg mebendazole (so 2.5mls)(vermox). They said any younger and the drug is not recommended but they'd have to find that out for younger but I didn't ask as I was fine for my kids.
Now to get rid of these gross little creatures :/

Thanks for your replies.
And highly recommend ringing the Rodney Whyte at monash number for any enquiries they were great and very helpful.