Is it safer to install with the ISOFIX method or the lap sash method? Haris February 26, 2019 23:28 Updated Follow Both methods are equally as safe. Please follow the installation instructions in your child restraint's instruction manual. Related articles How do I know if my car seat is ISOFIX compatible? Will Mother's Choice car seats fit into my car? When can I turn my child to be in the forward facing position? Can I use my overseas car seat in Australia? / Can I use my Australian child restraint overseas? Handy tips to maintain your child restraint: Comments 0 comments Please sign in to leave a comment.