Can any other Nuna brand stroller seats be used with the Mixx frame? I have an older model and the seat just isn’t comfortable for my baby, it’s like there isn’t enough structure and she looks like she’s sliding down when she is sitting in the more upright positions.
It used to be so that you could, with the U-shaped (Maxi-Cosi/Cybex) adapters, attach a Maxi-Cosi / Cybex / Joie / Recaro / Kiddy / Clek Liing car seats. Unfortunately, they stopped selling those adapters, trying to get more Nuna car seats sold, I guess. You can either try to find the Mixx - Maxi-Cosi adapters in classifieds or on eBay, or you could opt for the reclinable Nuna car seat perhaps - I don't see any other options for your situations vs. the Mixx frame.