A month old baby sleeps unsteadily and always struggles hard, it may be a calcium deficiency, but a baby this old is not really calcium deficient, but poorly absorbed calcium, which requires supplemental cod liver oil or vitamin D3 or vitamin AD. when the weather is good during the day, you can sunbathe, of which the sun can be supplemented with vitamin D3, which is known to promote calcium absorption. It is also possible that the outside environment is not quiet and comfortable enough, resulting in the baby sleeping uncomfortably, and only one month old, the ability to adapt to the outside world is not very good, so it will behave as a struggle. Another point is that the baby also has its own sleep time, if this point in time want to move, but for the baby activity is a very laborious thing, as the struggle very hard look. The above questions are for reference only, the specific medication, treatment, please subject to the guidance of the doctor interview.