Giving water to a baby at 14 weeks is not recommended as they must already be attaining enough hydration, nutrition, and calories they need for healthy development from breastmilk or from formula milk (breastmilk, especially, is naturally 88% water, anyway!). Water will not only make your baby full creating a possibility of aversion to milk but will also add no value to their dirt whatsoever. Giving water to a baby is recommended only at around 6 months after birth when you introduce them to solid foods.