A photo session with a newborn and a young toddler would be a total disaster right? Not at all!
Your newborn may not sleep (totally not a problem), and your toddler may be slightly nuts (my four year old is insane), but that's your beautiful, if slightly crazy, everything right there.
Going with the flow is so important, with a few crazy noises and singing a long the way (I'm so sorry to anyone who has had the pleasure!).
Kids like silly, and I'm a bit silly, so we get on very well :-)