The strange look on the baby’s face depicts as though as she is suspecting the woman carrying her despite her effort of grinning so hard to get her amused.
But, could the baby be suspecting something fishy in her smile? Could there be something weird hiden in the smile? Seems the little baby be like “Who are you again?’ or “You Again?” Quite funny!
Who knows what is in the baby’s mind? However, maybe she just dazed an empty look of suspicion.