Hello, I am thinking of buying your Molmini Plus Kangaroo model with waist support for my baby. My baby was born at 33 weeks, is now about 4 months and 6.2 kg. I would like to know a few things before purchasing: 1. Is the seat width adjustable on this model to support baby's legs, knee to knee? 2. Is the head-neck support suitable for small babies whose head control is not yet fully developed? 3. Does the product have a certificate of safety standard compliance or a test report? If so, can you share? 4. What is the minimum and maximum usage weight of the product? I've seen different weight limits in different postings. 5. Does the waist belt and shoulder straps provide enough support for the parents’ waist and shoulders during the long time using at home and outdoor? Since my baby was born prematurely, I especially want to get accurate information about safe and comfortable use. Thank you.