The concept of modular clothing can be characterized by obtaining clothing products that can be reassembled from different modules. A modular garment is one that can be disassembled into different parts or modules and reassembled at the will of the wearer. This is generally achieved through a variety of closures, from buttons and zippers to snaps and Velcro. The product elements can be fixed to add or change one of the product features. And then there is the more flexible version - geometric modularity where a product can be folded into a different size or shape. In the work, I presented how we can obtain more clothing products intended for premature babies. We focus on the diversification of the elements because they give us the opportunity to obtain the products of the appropriate dimensions. Currently, the trend towards modular clothing is more and more common, it offers the possibility for the clothing to be functional. Functional products are necessary for the category of wearers studied, being those that satisfy certain of their requirements. Methods were used to observe the types of movements performed, the medical devices to which they are connected, the position in which these wearers sleep. After that, functional modular systems were designed that offer the possibility to cover the child's body, minimizing the number of seams and optimizing the process of dressing and undressing through holes specially adapted for medical equipment.