Are the Fidelity funds inside your 403(b)? If so be careful to check, often when employers negotiate for 3rd party funds in a TIAA plan, TIAA gets to charge an extra expense fee on top of the regular one for the fund.
I'd recommend against TIAA's target date funds as they have significantly higher expense ratios than the component funds. Over the years that adds up. You can put the same funding into TIEIX (TIAA's internal stock index fund, ER shows up at 0.05% in my account), TCIEX (TIAA's internal international stock index fund, ER also shows up at 0.05% in my account), and if you really feel like it a little QCBMIX (bond fund, ER = 0.26%). Look in every few years and rebalance if you feel so moved. You've just replicated TIAA's target date funds at significantly lower cost.