Your baby will probably be able to:   Smile at 6 weeks   Roll over from a sideways position onto his/her back at 9 or 10 weeks   Raise his/her head and shoulders from a face-down position at 4 to 6 months   Sit unsupported at 6 months   Try to feed himself/herself with a spoon at 8 months   Stand up at 9 months   Say simple two-syllable words like“Papa”or“Mama”at 10 months   Understand simple words at 12 months