At that young -

I would just be mindful of not creating bad habit, don't put baby to bed with lots of props (toys, blankets etc)

Create a consistent routine.

I did a version of cry it out with all my kids (and daycare infants) around 6-9 months. Before then, I responded promptly to crying when possible. Sometimes that meant they waited a few minutes while I finished helping another child, but I didn't worry about training them to sleep un assisted until they were older infants.

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