My twins were born at 34 weeks. Max, who only spent 3 weeks in hospital, was smiling all the time and following me around the room by 3 months but his sister Hannah, who spent 8 weeks in hospital, was only just beginning to smile. Now, at nearly 4 months, Max is grabbing things and putting them in his mouth and has realised the consequences of his kicks and movements of his hands and is goo-ing. Hannah has found her hands and making noises with the smiles but is still behind her brother.