This article considers the related concepts of 'rehearsal' [Harney, Stefano, and Fred Moten. 2013. "The Undercommons: Fugitive Planning & Black Study." Brooklyn: Minor Compositions] and 'catastrophe' [Stengers, Isabelle. 2015. "In Catastrophic Times: Resisting the Coming Barbarism." Translated by Andrew Goffey. London: Open Humanities Press] as activism, focussing upon eco-somatic drama processes engaged through "In Your Arms" (IYA). This participatory arts project for babies and their primary caregivers was co-created in Naarm (Melbourne), Australia, by a four-person artist ensemble, ten pre-crawling babies, and their mothers. Multi-modalities were used, including improvisatory movement scores, natural props, sound-making and listening practices. The article suggests new ways to consider drama activity at a micro-sensorial scale, offering practices that cultivate environmental attunement and care from the very first months of life.