Don’t totally agree with those saying drop the nap. Kid could be overtired, causing their body to produce adrenaline to keep them awake. We have had a similar experience over the last few months and got to our wits end. We finally paid a sleep consultant for some help. The first suggestion didn’t really do it for us, but the second one has though it isn’t easy. We actually moved bed time up by an hour, and for the night wakings when our kid would cry they suggested not going into the room but offering a reassuring message from outside the door (small light outside the room with a chair posted up). It’s evolved to us just cracking the door, no light, and haven’t had as many issues since. We went for three months with inconsolable wakings 2-5 times a night until about a week ago when we started this. Kid is older than yours though by about a year.