If you're looking to buy a first laptop for a young child, we'll say it: don't worry too much about the specs. Most laptops will run just fine for the basic tasks a younger kid might want to do (schoolwork, watching YouTube, chatting to friends) so it's best not to get too caught up.
In terms of minimum specs to look for, Intel and AMD both make excellent processors; Qualcomm and MediaTek are okay too, but these will be lower-powered devices. 4GB of RAM should be considered the minimum; 8GB is ideal. Screen size is down to personal preference.
When it comes to storage, a 256GB SSD is generally the lowest we'd advise going - unless it's a Chromebook, which leverage cloud storage more heavily than conventional laptops, in which case less local drive space is fine. For graphics, integrated graphics are fine, but if your kid wants to play the latest PC games, be sure to buy a laptop with a dedicated graphics card instead.