Change can feel weird. Don't feel bad about your habits, you picked them up and if they're not serving you well, you can change them. It's pretty normal to be paranoid about gems when you have a baby, lots of people probably feel the same way.
Most things can be cleaned properly with hot, soapy water. Kitchen worktops, taps, sinks etc can be cleaned with hot soapy water if they're just a bit grubby. If you're concerned about something like raw chicken having contaminated a surface then you may want to use bleach to disinfect it. Bleach doesn't actually clean stuff though, it kills gems but doesn't remove dirt. Hot soapy water can remove germs by sending them down the plughole. You don't necessarily have to kill gems, just get them evicted.
Washing up liquid (WUL) is designed to be really effective on food and grease. If you have grease around your cooking areas, on kitchen cupboard doors etc try hot soapy water made up with WUL before buying specialist kitchen cleaners.
Bicarbonate of soda is great for neutralising smells. Leave an open container in your fridge to absorb any strong outdoors. You can buy a pot in home bargains for 99p. It can also be made into an abrasive paste for removing stains, e.g. inside teacups.
Cream of tartar (sold a a tub of powder, similar to bicarbonate of soda) can remove urine stains from toilet seats. Make up a paste with water or with vinegar. Leave it on for a while if necessary, and rub the paste to remove the stains.
If you Google "old fashioned cleaning methods" or "cleaning with vinegar" etc you'll get lots of ideas. Pick a couple to try, and find what works for you.