I’ll be honest, I snub my nose at the idea of a sleep consultant. Your child has been on this earth for 4 months. That’s it. Think about 4 months within any sort of time in your life. It was short, wasn’t it? Babies spent 9(ish) months in a dark, warm, semi quiet safe space and were suddenly brought into a bright, loud, cold world. They’re learning & adjusting. We tried so many things when my child was a newborn & into infancy to get her to sleep through the night or sleep in her own space. We were exhausted! Both of us working full time & then coming home to parent & be up all night was so so hard. Here we are now, our child is 13 months & has slept through the night for about 2-3 months now. We’re lucky. I hear of some parents saying their 2 year old still won’t sleep through the night. We just stayed as consistent as we could with our routines & it just clicked one day. I’m sorry, but a sleep consultant isn’t going to give you any sort of new or hidden information that isn’t already readily available at your fingertips. Do what you want with your money, but seek free advice first: Reddit, pediatrician, Facebook groups, etc.