I don't want to be the guy to say this but I will. Maybe you should be looking at living within your means. Specially with a baby on the way your money situation is only going to get worse and it will be the animals that will suffer.
If you have to chose between treating your animals or feeding your child the animals will obviously go untreated and will die or have to be re-homed.
I know it's advice your looking for but without the means (finances) to follow through with the necessary advice and items you need then there is no point seeking the advice.
Just My opinion and I apologise if what I have said offends anyone.
Good Luck.