That lens may be too long for your sensor for photography while inside. It will have approximately half of the angle of view of a 50 mm lens. It's a good focal length for portraiture, but only if you can get far enough away from your subject.
Basically, you want to be able to stand far enough away from your subject to avoid perspective distortion: while some photographers with some subjects are able to pull it off successfully, you risk making the subject look comical. Instead, a commonly-suggested working distance of 10-15 feet from your subject is usually safe, or if this isn't possible, at least as far away as practical.
Where are you planning to photograph the babies? If outside, then you have far more flexibility to use a longer focal length in order to get "close up" detail and greater background blur or 'bokeh'. In this case, any focal length greater than about 70 mm should do well; longer focal lengths as well as wider apertures both help increase the amount of background blur, but be sure that your background is distant.
Basically, you want to be able to stand far enough away from your subject to avoid perspective distortion: while some photographers with some subjects are able to pull it off successfully, you risk making the subject look comical. Instead, a commonly-suggested working distance of 10-15 feet from your subject is usually safe, or if this isn't possible, at least as far away as practical.
Where are you planning to photograph the babies? If outside, then you have far more flexibility to use a longer focal length in order to get "close up" detail and greater background blur or 'bokeh'. In this case, any focal length greater than about 70 mm should do well; longer focal lengths as well as wider apertures both help increase the amount of background blur, but be sure that your background is distant.
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