Whenever anyone makes the entirely reasonable point that people should carefully assess their finances before having children, someone always trots out the “so only rich people should be allowed to have children..?” line.
You do not have to be wealthy to have children. You do need to be able to feed and clothe them plus provide a roof over their heads.
In addition to that, if you intend to return to work you need to work out if you can afford childcare because unfortunately it costs a lot in this country. It is absolutely shit and unfair but it is what it is and you need to do some basic research so that the costs do not come as shock to you.
If you are on a low income, you will be entitled to help with childcare costs so calculate if that help works for you when you take into account your other costs.
If you are mid to high level salary you get no help apart from whatever has now replaced Childcare Vouchers (I don’t know how the new scheme works as my DC are 7 & 9 so I’m still able to use the old style CCV) so again, calculate the costs.
If you work out that your finances will be tight but it’s doable and you want children then I’d say go ahead. The following years will be tough but there is light at the end of the tunnel when they start school.
If it isn’t doable then my suggestion would be to wait; explore if you can get a higher paid job or work out if staying at home FT and claiming help is feasible.
This doesn’t mean only rich people can have children. It means you need to apply common sense and a basic assessment of income vs outgoings (hint: don’t follow Truss Economics theory when working this out) or if help from the state will be sufficient for you to get by.
It seems to me that some parents have children whilst fully aware that childcare costs will be unaffordable but cross their fingers, hope for the best and then despair when reality hits and they realise finding £1k+ a month really isn't doable.