Table 1. Identified HMO structures and their relative abundances at each time point.

Structure	Relative Abundance (%)			Number of Samples Found In
	Week 4	Week 16	Week 20	Week 4	Week 16	Week 20
LNTa,b	23.8	21.3	22.7	33	33	33
LNFP I + III	10.3	10.5	10.2	25	29	28
LNnT	8.68	10.9	10.7	18	26	25
LSTca,b,c,d	4.86	3.26	3.76	33	33	33
MFLNH I + IIIb	3.82	2.87	3.23	24	29	32
MFpLNH IV	2.57	3.71	2.93	32	30	31
LSTb	2.29	3.19	3.16	33	33	33
LNnH	2.44	2.46	2.32	33	33	33
DFLNHa	2.48	2.14	2.50	30	30	28
LNHa,b,c,d	3.50	1.72	1.67	33	31	33
DFpLNH II	1.68	2.81	2.20	27	27	28
DFLNH bc,d	1.24	2.19	2.71	28	25	25
3′SLb,c,d	0.776	1.25	1.38	33	33	33
4021a + S-LNnH II	1.19	1.07	0.986	32	28	29
IFLNH III	1.03	1.03	1.01	31	29	29
F-LNO	0.712	0.522	0.527	29	26	26
2′FL	7.66	11.8	9.85	22	23	25
LNDFH II	3.55	3.34	3.97	19	23	21
LDFT	1.97	4.27	3.88	24	24	25
4120a	2.16	3.46	2.51	16	11	14
TFLNH	1.52	1.80	1.72	18	18	18
p-LNH	1.69	1.57	1.36	23	21	23
F-LSTc	1.16	1.48	1.16	23	18	19
LNDFH I	0.547	1.34	0.907	5	9	10
5130a	1.36	0.669	0.726	27	22	22
5230a + DFLNnO I/DFLNO II	0.968	0.592	0.652	26	24	24
5330a	0.741	0.700	0.647	17	10	11
IFLNH I	0.709	0.621	0.721	22	20	20
DFLNnO II	1.01	0.468	0.550	28	23	23
DFLNO I	0.842	0.571	0.548	27	18	20
5130b	0.673	0.518	0.420	16	8	8
S-LNH	0.815	0.305	0.356	33	15	15
LSTa	0.341	0.355	0.431	24	25	25
LNFP II	0.355	0.362	0.318	18	22	21
6′SL	0.370	0.288	0.243	26	16	15
DFLNHc	0.237	0.204	0.322	13	5	6
5130c	0.277	0.283	0.200	17	6	9
4320a	0.224	0.247	0.217	8	5	6
3FL	0.164	0.263	0.249	9	15	14

^aSignificant differences in absolute abundances between week 4 and week 16.

^bSignificant differences in absolute abundances between week 16 and week 20.

^cSignificant differences in relative abundances between week 4 and week 16.

^dSignificant differences in relative abundances between week 16 and week 20.