Has it ever happened to you that a child has been sleeping poorly all …

Has it ever happened to you that a child has been sleeping poorly all night, sucking on their thumb if I take it away they cry. It's happening for the first time. We're a month and a half old, and we've had these problems for about three or four days now. I don't even know if I'm sleeping or not ? And with daytime sleep, some problems started, sometimes one day sleeps, sometimes two, and sometimes the first nap can be only five minutes and that's it. Before, he slept at least 40 minutes during the day, maximum 2-2.5 hours. And at night he woke up 2-3 times. Could there be a jump?