I just closed this week on a refi. In my case, and YMMV, they specifically looked at accounts that were in the 6 months or less range. They look at new credit. There were comments added to the app by my mortgage broker regarding them. There was nothing said about the accounts I opened in Feb and Mar. 

Will apps prevent you from getting a mortgage? Not necessarily, but you also have new young file. Personally, if it was me I would try and age the accounts 6 months. 

DH and I had mid scores around 715 and 725 but we had established older credit accounts to go with the new credit. 

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Starting Score: 693 TU FICO, 679 EQ FICO
Current Score: 748 TU(12/12), 771 TU98 , 824 TU08 FICO, 776 EQ FICO , 735 EX(9/12) FICO
Goal Score: 750+, but shooting for the 800's
my wallet: Hyatt Visa Sig ($23K), B&N World MC ($17.3K), Amex RP Gold (NPSL w/ S&T), Hilton Surpass (10K), Freedom Visa Sig ($8.6K), Discover It ($8K), Amex BCP ($9K), FNBO Visa (13.1K), Citi Dia Pref MC ($3.7K),Sam's D ($8.5K), Walmart D ($7.5K), JCP($5.3K), Dicks MC ($2K)