Deductions & credits

No my dependent turned 2. I'm fine if the rules changed but I would like to see what the difference is between using the standard deduction and itemizing. Trying to grasp why exactly we had a much larger chunk of our income go to federal income tax in 2018 than in previous years. Is there any way to get the generated itemized return so I can see what's different? I build financial software for ERPs for a living and he developer in me senses that something might be off.  It's going to drive me nuts until I know for sure.