Honestly I think they are heading towards their main source of income being their merch/blankets. Let's say for talking sake, she sells 100 blankets with £35k profit (we know it's way more than this), then she's raking in £3,500 TAX FREE (I still stand by the fact it's not a legitimate business and she's not declaring or paying tax on any earnings from it).
That's not taking into account the notebooks and the other shite she sells. If she has two blanket launches per month, that's at least £7k just from that shite alone, and they must be making around £3-5k per month from YT I would suspect. Yes their outgoings are also high, but at the moment I don't think they're as hard up as we think. If the tax man were to come into play for BabyandMe it would be a whole different ballgame!