Is this enough yards of yarn using 2 stands at the same time with size 19 needles?

I have 4 skeins of Caron Simply Soft Brites(6 oz) and I want to make a baby blanket that is 32 inches wide and 32 inches tall with size 19 needles.Do I need more yards of yarn? And if I use 2 strands will the blanket be too loose?