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Absolutely hold off especially if credit is borderline, needing 2 years of employment is key but could overcome that with same field but it's much smoother for UW if they see 6 years on job instead of 6 months.
Wait... as LONG as you are in the same job field, and no gaps on employment, no reduction in income or how you get paid it WILL NOT hurt you. I have just had the EXACT same situation recently.
I actually applied for the mortgage in December, changed jobs in January during the mortgage process and there were no issues. And I had some challenges on my credit too, including short sale.
Situations what you need to avoid:
Switching from a nursing job to a IT tech job
Switching from a cashier at a gas station to a rocket scientist (yes much better job but makes a difference)
Switching from a full time job to a part time job
Switching from a job that pays 75K an year to a job that pays 30K an year
Switching from a job that pays 75K an year to a job that pays 10K an year and 70K in commissions
Quitting your current job and search for other while unemployed
Makes sense?