My baby is 4 months old. She sleeps very less in night around 1 hr continuous not more than that at a stretch. It takes almost another hr to make her go sleep, sometimes even more than hr and cries continuously in between those naps and even her day naps are of just around 20mins even those naps are 3-4 only... How should I deal with this... will her lack of sleep harm her brain development... please reply asap...