No cereal or any othe solids till your baby is 6 months or older. It is a old wife's tale that cereal helps sleep through the night. Too early introduction of solids can cause allergies, problems with digestive system later in the future because little baby's stomach is not able to handle anything else but milk or formula. It is like an investment into your baby's health, if you postpone solids till that time, he gets better chances to have a healthy and longer life.
He is not too young to start cluster feeds and dream feed. Most babies naturally want to eat more often in the evenings, they fill up their tummies for the night. You can aim to feed him every 2 hours instead every 2.5 in late afternoons. To do a dreamfeed you need to pick him up when he is in a light phase of sleep, when he stirs a little. It does not always work right away, in my case, Anna didn't want to open her mouth for the first 5 or 6 nights but at 7 th she nursed!
Good luck!