For that line of thinking to work, logically, any new location has to be stressful for baby. Regardless of caregiver presence or responsiveness. Now even if they (sleep consultants) insist that this only applies to sleep, they are still making the claim that babies will automatically have higher cortisol levels if they are in an unfamillar location.
Which means that they would have raised cortisol; when you go to vist family, go camping, go to the beach for a weekend, go on vacation, move house, move them rooms, move them from a bassinette to a cot, if they are out and about in their stroller, or carrier, if you start them in daycare, and so on.
In other words: you are stuck in your house for every sleep for the entire first year at least.
There are very few upsides to being a single parent with a partner who lives interstate.
But one of the few silver linings is that if you decide to bring a new partner into you life, you can choose someone who's parenting values match yours.
Hi I'm Nicole