Scared to leave the house because my baby is a ticking poo timebomb

Last week he went 3 days without pooing and then did the most MONSTROUS nappy, it genuinely was so much poo it stunned both my mum and nan into silence. Luckily we were at home so I could sluice everything down in the sink, but the cleanup was a 2+ man job!

Tomorrow will be day 5 with no poo - and I am meant to be visiting a sling library! Feels like an absolute disaster waiting to happen... and its quite a long bus ride away.

(Medically I think we're fine - seems like it's normal for breastfed babies to go a while without pooing and he's not distressed or straining, but I have messaged health visitors lol).