Your baby isn't manipulating you when they refuse the crib and sleep beautifully on your chest. They're doing exactly what human infants are wired to do. For the first few months of life, babies lack the neurological maturity to regulate their own temperature, heart rate, and breathing independently during sleep. Physical contact with a caregiver provides co-regulation — your body literally helps their body maintain physiological stability.
Research by Feldman et al. (2014) demonstrated that skin-to-skin contact in the newborn period is associated with better autonomic regulation, improved sleep organization, and reduced cortisol levels. Your warmth, your heartbeat, your smell, and the gentle rise and fall of your breathing help your baby stay in deeper sleep and navigate the vulnerable light-sleep transitions between cycles. This is why contact naps are often 90 minutes and crib naps are 30 minutes — baby wakes during the first light-sleep transition because they don't have your body to help them bridge it.
This is normal. It's not a problem to solve in the early weeks. Understanding how baby sleep cycles work helps explain why contact naps run longer. The question is only when and whether you want to transition to crib naps — and that depends on your family's needs, not on developmental timelines imposed by sleep training culture.