Our 2 month old breast feeds 90% of the time, but if my wife is away we will use pumped breast milk from a bottle. The other day my wife was out and we only had 1.5 oz of defrosted breast milk. Our baby usually eats 2 oz per feeding, so I added .5 oz of warm water so that she wouldn't get hungry before mom got home (first time I've done this).
My wife says this is bad and could lead to water intoxication. Is this correct? Should I avoid adding water to breast milk at all times?