I'm only just retiring this tshirt and Liebling is almost 7. Cutting out cow milk helped, but wasn't the complete answer. We coslept, bedshared, separate room slept, allergy tested, osteopathed, "drowsy" medicate, routined, stayed up late to sleep in, no drinks in the evening, oaty suppers, day slept, did not allow day sleeps... Yeah, years of hell basically. You have my sympathy.

Advice? Do whatever you want. Stuff other people. Baby sleeps when baby sleeps and very little will affect it. Til then, coffee works wonders. As do sympathetic shoulders. Seek them out and do not talk to those who blame your parenting (like my mother).