I took my son to Pacha, he was 6 weeks old. I think they were so suprised at the sight of the carry cot on the door, they thought what the hell. Don't worry, we only in the quiet bar with him.
We tried the same thing at Space closing the same year (1998), but they didn't go for it. We had to do shifts of baby sitting on the grass outside. Luckily they had unlimited passouts then.
