If stool is bloody, call the doctor immediately. It is also unusual if your baby draws legs up as if in pain or the stool has an unusual or bad smell. Unusual - skin feels hot, cold, sweaty, clammy, moist, burning. You do not usually take a baby's temperature unless you think something is wrong. Usual activity is age related.
Babies develop the same skills around the same ages.
Developmental Milestones are the way professionals measure a baby's behaviour and growth. Although there are variations in the exact time a baby can do these tasks, they usually progress through them in the same order and at about the same time. If your baby is unable to do these things at the appropriate age, the doctor should be told.