I saw on April or May that they were doing weekly threads for recommendations/discussion on the bigger items. I like the idea so I'm copying it. Plenty of discussion beyond just what to get is welcome here. Especially for this topic. You can learn more at https://www.safekids.org/ and use this link to find a Certified Child Passenger Safety Technician in your area. https://cert.safekids.org/get-car-seat-checked For me, the local children's hospital has someone available for a few hours every week for free. She'll walk you through installing, making sure the fit is right, etc.
And yes, this kid shouldn't be wearing that coat while riding in her car seat.
Me: 34 DH: 38 Married: June 2011 TTC since Feb 2016 BFP#1: 7/7/16 MMC: 8/16/16 BFP#2: 5/8/17 - CP BFP#3: 6/27/17 EDD: 3/10/18