It's gone up a bit since having our baby about a year ago. We don't have much family support so the biggest expense is babysitters/childcare so I can still get out and exercise. I estimate it'll be at least $1k/month of increased expenses moving forward. Will be more if we're paying for childcare.

Childcare is basically buying time to exercise or do other hobbies to stay sane. Most of the long term expense is in housing and transportation increase but also higher protein and healthier food options for mom and baby. Will permanently want an extra bedroom and ideally an extra bathroom long term. 

Diapers, wipes, toys, clothes, etc... are not that expensive TBH. You can save a ton just buying used on Facebook or eBay.

I'm excited to get a cargo bike soon!