Neutrogena Hydro Boost Water Gel, with its clean formulation centred on hyaluronic acid, is generally considered safe and suitable for use during both pregnancy and breastfeeding, as it provides lightweight hydration without containing harmful ingredients like retinoids or strong acids. However, if you have very sensitive skin or a history of allergic reactions, it's best to do a patch test before full use. Also, avoid applying it to areas like the nipples while breastfeeding to prevent any product residue from being ingested by the baby, as a general safety precaution.