Our son is 4.5 months and having a problem with waking up after 4 hours and then every 2 at night. We tried letting him cry for 5 min and going in to soothe him, it worked after 30 minutes-- we were so excited! Until an hour later and he woke up. We tried again going in after every 5 minute but after an hour we were more sad and exhausted than he was. We gave up and I held him and rocked him to sleep. What should I do? I'm exhausted and feel like I'm not doing anything right for him. 😭