Imma be real with you, that ain't gonna happen; toddler is small so +1 AC, night time and it's dark so total concealment 50% miss chance, and let's be real here you're a human with average stat distribution so no pluses on dexterity based attack roll, guns have a range of 20ft before taking minuses on the attack roll every ten feet so minimum -1, and without gun training you're not proficient so it's further -4 penalty to attack roll, and it's a surprise round anyway and going for your gun is a move action; imma be real I just don't see it happening.